Rantom bottles warmer,warming baby bottle for USB adapter and connecting with power,computer,cars and else USB charger.

Seems to work pretty good. I’m not using it to warm bottles, but am using it as a make shift “dew heater”. I had to combine 2 of them to fit around my Celestron 6se, but they seem to do the trick. Time wil tell how functional. But for now, I have been outside in 19 degrees for a couple/few hrs at a time, and while frost was forming on the ground, my lens stayed clear. May need to get one small one to go around the eyepiece. Two of these was 1/4 the cost of a true telescope dew heater. My 6000mah external battery drained fast out side along with running both heaters. I now just use an extension cord that has 2 built in USB ports.

I finally got a chance to use this heater on my camera lens, and it worked great. I plugged it into my Juice Pack that i use to charge my phone, i only needed it for a short time so i cannot comment as to any form of battery life while using it. It fit fine on the hood of my Tamron 70-200mm f/2.8. The power cord is long enough that i slipped the Juice Pack into my shirt pocket while shooting, and it had plenty of length.

Have been using it attached to an external USB power unit. Fits my needs!

Seems to do a good job, fit my cannon 55-250mm lens. I used my batter bank to plug the lens warmer and it worked just fine. The cable length of the warmer had ample length to be able to put it In your bag or pocket. So far so good.

good finishing quality will be used as lens warmer and I think it will do the job perfectly

Use a a bottle warmer and it works perfect

Im sorry to say this but it doesn't heat up a bottle as it says. I wouldn’t recommend any parents to waste their money this product if they want to use to warm up there babys bottle.

Crap! Dosent even get warm. If I could give zero stars I would. Don’t waste your money.