DEFT Trackball Mouse, 2.4GHz Wireless, Finger Control, 8-Button Function with Smooth Tracking, Ergonomic Design, Optical Gaming Sensor, Windows11, macOS (M-DT2DRBK)

All in all a great product. Size, feel, quality all on par or better when you consider price. I bought this one just to try it out and see if the company was legit. I can honestly say that i am more than sold on the company and the quality and i have no reservations about spending considerably more for one of their high end models. Im actually excited to see this company's high end features bells and whistles.. The only real issue with it is customizing the extra buttons. The software they provide is garbage. And to make matters worse, isnt even in English. You will have to find another software to customize the 6 7 8 buttons. This is the issue that keeps me from giving it 5 stars. But other than that, its terrific. Fast, accurate, comfortable. And at fair prices... i highly recommend. UPDATE: Its now 2023. Ill save u the details but I was asked to give my opinion on ergonomics as it relates to office workstations. I was given the opportunity to do some research on several companies including Logitech, Kensington, and Elecom. The funny part is no one on the team had even heard of Elecom before my recommendation. Comes to find out, they chose Elecom mice for every new workstation in the facility including the main dispatch center hub where they no doubt are going through a trial by fire. And not a single complaint has come up about the performance, and they were actually praised for their customization as dispatchers like to program their mice with their own shortcuts for maximum speed and efficiency during their shifts. So I must retract my initial review about their programming software and tell you that it's much improved. And that's not just from me. That's from a whole 911 dispatch center crew of over 30 dispatchers who have no skin in this race. I'll be honest I forgot about this initial review and never would have paid any attention to it if I had not given it a poor review initially. I stand corrected and concede that improvements are the new order of the day. So Elecom gets the 5th star. Oh, there is still 1 tiny issue... The product info is still written in Japanese so you have to go to the Elecom website to get it translated to English. Lol. Pound for pound.... And I can't believe I'm saying this... Better than Logitech and Kensington. Elecom quality and price is equal, if not better than the big guys , and they offer more innovative options to their products so u get more for your money. At the end of the day, Elecom is doing what any new guy should be doing., better product at better prices, and letting their performance do the talking. And again, Elecom doesn't even know I exist and they don't pay me a single dime to say any of this.... I just believe good quality products should get a little recognition every now and then .

UPDATE - April 2017 - STILL extremely happy with this cool, tuffy trackball!! I'm still working 2 intense business jobs, one of them IT and software implementation for accounting. This mouse has held up amazingly to all the road-wear I've thrown at it with travel/working in 2 locations and switching between PC and Mac. Performs great with both cheap-o Toshiba PC laptop and newer Macbook Pro Retinas (have 2 of them). Company's software for Mac - El Capitan works great for programming buttons. NO COMPLAINTS! ------------ UPDATE - November 2016 and still very happy with unit - it's held up well. Wheel squeaks but only once in a while. Same battery that shipped with it is still in use! ------------- I'm ordering another one. This is the trackball I've been waiting for. And while it's not quite perfect, it's about 90-95% there, at least for me, and worth the $. After 20 years of trackballs and heavy computer work using an array of input devices - this is one of the best. Esp if you're mega-mobile. I work in internet research, accounting software and huge spreadsheets by day then heavy computer music composition at night. Lots of numbers, details and audio/video editing. Pop in and leave the low-profile radio receiver into a USB port and it works even before you install the software. Finger hole through bottom of mouse makes it easy to pop out the ball for roller cleaning. But Trackball STAYS securely in mouse when it's put back in. You'll need to clean the rollers once in a while week if you have greasy, sweaty paws, like I do moving around a lot. Switch on bottom of unit appears to have on, low and high resolution modes. Couldn't tell much difference between low and high but I haven't been working on hi-res imagery lately in Photoshlop. USB Radio receiver tucks elegantly inside for storage if you can't leave it in your computer port. Scroll wheel did squeak for a little while but then it went away. Might be heavy humidity here and temperature shifts. I'm not too worried. I'd rather have durability and consistent performance. I'm writing this review because other trackball afficionados who need ease-of-use and portability should consider this unit. For a newly designed device, Elecom got it most of it right. If this thing is still cranking away like my half-dozen Marble Mice have, they'll really have nailed it. Will repost as this thing gets more use.

Overall a great product. I find switching between a thumb trackball and finger trackball is ideal. I've purchased both the gray ball and red ball models and have been happy with them. As they have aged (3 to 6 years old), I seem to be developing a problem. They disconnect or simply do not work. At first I thought it was batteries. I would change them and they would work and this worked for a while with shorter and shorter intervals that the trackball stayed working. Next, I tried unplugging and re plugging the dongle. It worked sometimes. I had/have the dongle plugged into a 4 port (now powered) usb hub. I found that I needed moving the dongle to a different slot worked - for a while. When that quit working, I removed the dongle from the hub and plugged it directly into the PC and that worked - for a while. I think I've found a solution which points to a problem. If I "jiggle" the dongle or push right or left while in the socket, I can get the trackball to connect. They are all at least three years old and most have been plugged into the same slots for at least two of the three years with no problem. My worry is that the contacts are losing connection (oxidizing, maybe?) which concerns me as it seems these are one dongle to one trackball and if either dies, the other us useless. I really like them but I'm concerned about how long they will continue to work. For background, I have a couple of this same brand left handed trackballs - one red ball and one gray ball. No problems with either of them. For reference. I've managed to "wear out" four Logitech 570 thumb trackballs.

03/05/2020 This is the best finger controlled trackball that I've found in the last 15 years or so, as far as shape, customization and compatibility, BUT the quality is inconsistent to say the least. I would lower it to 2 stars, but I keep coming back for more. On the one hand I really can't afford to keep buying these, but I'm disabled and spend most of my time reading news, playing games, or tracking down interesting/fun info. So this is my major tool each day and the size and ergonomics are great. My latest purchase was in December and has had a scrolling issue the whole time. It doesn't matter which program or site I'm sing, which DPI setting is in use, or how the scrolling is set up in the software it will somehow switch to 'super speed and go right down to the bottom' - not like a page down, just really fast scrolling. Feeling kind of silly after having Amazon keep replacing these I've been trying to live with it. I'm giving p and ordering yet another. At least I'll have backups for my backup. 12/07/2019 Okay, a little longevity problem here even without dumping liquid. The problem seems to be with the negative contact spring for the battery becoming squashed and/or loose over time. I'm no longer able to work on small objects so this was determined by originally successful jiggling (highly descriptive old tech term) the battery, later successful gently re-stretching the spring, and finally unsuccessful attempts of both. I've switched to rechargeable batteries now and can read on the charger that these are not discharged.. However, the lack of other good finger operated trackballs has me coming back for another. The ergonomics are great for me and motion and settable commands bring extra precision. After knocking over my water glass on my Elecom trackball one too many times (though what's amazing is that the ball and the front left button still work - it will still be a better backup than the Logitech Marble) there was no question about replacing it with another Elecom. This trackball is almost as good as the legendary Microsoft Trackball Explorer. My MTE served me well for over 15 years of heavy use, and trying to find a good finger controlled replacement has taken quite a bit of time and money. I physically can't use a thumb controlled trackball. Some of my pros and cons may make me sound very careless, but a spinal cord injury makes it very easy to drop things and/or to knock things over. Pros: It's very comfortable for the way I hold and use it, The choice of many keys can make a lot of things easier, "Programming" a custom key isn't difficult, The ball stays put, unlike any Logitech, The shape and locations of keys is ergonomic, unlike any Kensington, (I'll get to the size under cons), The physical switch choice of High and Low, Cons: I have large hands for a woman and it is a little bit too small, It uses up batteries fast, especially in the high DPI mode, The battery door is really easy to lose, Better English instructions would be nice. I looked at the new larger version https://smile.amazon.com/ELECOM-M-HT1DRBK-Wireless-Trackball-Mouse/dp/B0735584RM/ref=sr_1_3?ie=UTF8&qid=1542401940&sr=8-3&keywords=ELECOM+M-HT1DRBK but the shape might be harder for me to use, and the added features just didn't seem worth the additional price for me.

I really love this trackball mouse. I had a wired trackball mouse a very long time ago, that worked really well. And it was just an upside down mouse, meaning the tracker was on top and there were only left- and right-click buttons. My new wireless mouse is on par with regard to accuracy and reliability. It's a bit more powerful than I need, since I only use the on/off switch, (when I remember to turn it off), the trackball, the left and right click buttons, and the scroll wheel. When I turn it on, I leave it on the low power setting. I use the low pointer speed and it's very responsive. I have yet to investigate the three programmable function keys. I got the impression this is something geared toward gamers, and that's not me. What brought me back to the trackball mouse is that I was able to find a wireless version that is affordable. Primarily, though, I really needed something that had a minimal footprint on my busy desk. All I have to do is move it to the most comfortable position and leave it there. I have no stress on my wrist, and I can cover distances on my screen with only forefinger and thumb movements. Click and drag calls for some getting accustomed. I'll develop muscle memory for this again soon enough. It's sleek even with the raised profile. That, likely, helps my wrist to be supported. Zero need to slide the mouse around in small settings, during travel, working away from home or office, means that I can still get around my screen effortlessly, just like at home or work. Worst case, I once used a trackball mouse on my lap to work in a small setting. And that mouse was wired. I didn't suffer any loss of mouse movement; it was just a bit awkward, and no fault of the mouse. Soon as this mouse arrived, I put away my cute pink one that matches my keyboard and got busy with the new one. And, save for the aesthetic hit I've taken, I don't for one minute regret returning to using a trackball mouse.

Great design and feel. I went from a Logitech trackman to this. It is smaller than the logitech which is can be a bad or good thing depending on you hand size. It is comfortable for me. Only thing I had to get used to is the right click button. It is small and not the same size as the left click. Its not too big of a deal, you just have to reposition your ring finger when holding the mouse. There are a lot of buttons that you can customize which you don't have to use if you don't want to. It has a scroll wheel with back/forth buttons already program. Overall i'm happy with purchase especially at the price point.

Highlights after a week of use: Latency (lag) is beyond frustrating, usb dongle only. No Bluetooth. Trackball will not roll smoothly. No matter how much polish you give it. Build quality is a bit unfinished with rough edges and ball rests on plastic nubs. Only positive aside from sale price, programmable buttons are why I tried for a week to use it. Had to return, maybe a bad/used unit? I'll look elsewhere. For a week I tried to love this mouse. As a Logitech marble user for well over 20 years. Last year I bought a nice wireless Kensington marble but lacked good scrolling. Then this Elecom dropped its price to $25 (July '24) and I quickly bought it. I was excited at first, because of scrolling wheel and customizable buttons. Unfortunately, no matter what I tried the mouse itself has latency (lag) issues. The ball also suffers from a less than smooth roll. Just trying to click smaller on screen items required many attempts to hit. I often rolled over and past things because the hiccup in connectivity. My other trackball mice roll like butter, even as they get dirty. This ball, even after polishing with my best automotive wax, still rolls like the tabs it sits on are made of bad plastic and not anything a bit more slippery. I will admit after multiple usb ports to see if it was my 2024 Asus gaming laptop might be the issue. It did the same on my laptop from 2023 too. It has to be a bad mouse. Maybe a design flaw or just a bad unit. The only redeeming feature, those 3 programmable buttons will be missed. I had to return this mouse because it had too many issue to use daily. Maybe another option will be worth trying on prime day.

I have one of these DEFT models, as well as an EX-G model. While I've had no problems with the EX-G, the DEFT is driving me crazy! It has terrible connectivity. Sitting only about 10' from its receiver, the cursor movement is jerky, and every so often, it just stops receiving commands! Sometimes, just moving it a bit restores connection. But, other times, I must get up, unplug the receiver (dongle), and plug it back in to restore the connection. Unfortunately, I made no attempt to contact the maker for quite some time after 1st observing this, allowing too much time to pass before doing so, and I was about 5 weeks outside their warranty period! I finally did contact them, and they've simply ignored me! So, I still find them at fault here. I pointed out that I had 2 of their products, not just one, making me, already, a repeat customer. I explained to them what I was experiencing, and asked them if I had a defective receiver & also asking what they could do for me. I never made any demands of them, nor requested any warranty support, only a solution to my problem. I sent them that message on 03/01/25, directly from their web site's support portal. It's now 03/12, and they've simply ignored me. While I found the EX-G to be an excellent mouse, supported by software that makes assigning functions to its various buttons quite easy, I don't take being ignored lightly. I may have been a repeat customer in the past, but Elecom can rest assured that I'll never be one again! There are plenty of alternative makers out there. Sooner, or later, I'll find one who actually cares about their customers. ¡Adios, Elecom! PS: Now, the front button has become intermittent! JUNK