---
product_id: 90521387
title: "5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight)"
brand: "fxt"
price: "13 DH"
currency: MAD
in_stock: false
reviews_count: 8
url: https://www.desertcart.ma/products/90521387-5-8-ghz-fpv-transmitter-25-200-400mw-switchable-video
store_origin: MA
region: Morocco
---

# Switchable power: 25/200/400mW for flexible range 5.8 GHz frequency for ultra-clear video Smart OSD with manual channel input & memory 5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight)

**Brand:** fxt
**Price:** 13 DH
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Elevate your FPV game with the Black Knight’s unstoppable signal clarity!

## Quick Answers

- **What is this?** 5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) by fxt
- **How much does it cost?** 13 DH with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/products/90521387-5-8-ghz-fpv-transmitter-25-200-400mw-switchable-video)

## Best For

- fxt enthusiasts

## Why This Product

- Trusted fxt brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Friendly Safety:** Built-in low voltage alarm and power-off memory protect your gear and ensure uninterrupted FPV sessions.
- • **Custom Channel Control:** Create and save your favorite FPV channels with smart OSD for seamless switching mid-flight.
- • **Power Mode Flexibility:** Easily toggle between 0.1mW, 25mW, 200mW, and 400mW to match your flying environment and regulations.
- • **Reliable Signal & Range:** Experience crystal-clear video transmission with long-distance stability that keeps you ahead of the pack.
- • **Lightweight Micro Design:** Ultra-compact and featherlight to keep your drone agile without compromising flight time.

## Overview

The FX878T Black Knight is a compact 5.8 GHz FPV transmitter featuring switchable power levels (0.1mW to 400mW), smart OSD with customizable channel banks, and a lightweight design that minimizes drone load. It offers stable, long-range video transmission with MMCX antenna connectivity, low voltage alerts, and power-off memory for enhanced user control and safety.

## Description

Features:  1.With smart OSD and control board, you can make your favorite channel list from channel bank  2.Micro sized and lightweight 3.Plug and play. 0.1mW, 25mW, 200mW, 400mW switchable 4.Low voltage alarm. Power off memory 5.MMCX antenna connector Specifications Input voltage:7-28V working frequency: 5.8GHz Output power: 0, 0.1mW,25mW,200mW,400mW Current consumption: max 300mA@12V Frequency range: 5658-5917MHz Available channel: 37channels Extra features: Smart OSD, PIT Mode Video format: NTSC/PAL Video band width:6.0 MHz Audio carrier frequency: 6.5MHz Antenna connector: MMCX-KE Port connector: JST-GH,6-pin Dimension: 37.5x26.5x7.3mm Weight: 6.4 grams excluding antenna and cable Package included 1 x Video transmitter 1 x Key board 1 x OSD control cable 1 x OSD extension cable

## Features

- 【With smart OSD and control board】Manually input the channel. You can make your favourite channel list from channel bank. Enjoying more FPV fun with this VTX.
- 【Small Size, Light Weight】Micro sized and lightweight. Light enough, won't increase the FPV Drone flight load.
- 【Multi-power switching selection】Plug and play. 0.1mW, 25mW, 200mW, 400mW switchable.
- 【Specification】Low voltage alarm. Power off memory. MMCX antenna connector.
- 【Stable performance and great video quality】Long transmission distance and strong clear signal.

## Images

![5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) - Image 1](https://m.media-amazon.com/images/I/81f75DKZ6dL.jpg)
![5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) - Image 2](https://m.media-amazon.com/images/I/81zcKbOGiYL.jpg)
![5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) - Image 3](https://m.media-amazon.com/images/I/71Eng0+rwOL.jpg)
![5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) - Image 4](https://m.media-amazon.com/images/I/717PzV+GxSL.jpg)
![5.8 GHz FPV Transmitter 25/200/400mW Switchable Video with Smart OSD (FX878T Black Knight) - Image 5](https://m.media-amazon.com/images/I/71u5NtJ3rYL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ FXT makes good equipment
*by E***B on October 8, 2018*

Conclusion: All in all, this 'should' be very reliable and I liked the form factor and 400mw power output level.FXT is one of few companies out there that I've not had any catastrophic failures with. This is extremely important to note for a Vtx of course. Because 20x20 4in1's aren't quite up to par yet, a Vtx that mounts on a 30x30 platform makes more sense for the way I build things. FXT has gone above and beyond and created an OSD on the Vtx itself. You can plug a control board directly into the Vtx and go to town with all the settings right in front of your face. I usually don't change my Vtx settings much but if I did, I'd probably prefer smart audio but this is a really sure fire way to go about things as well.

### ⭐⭐⭐⭐ Is this the right VTX for you?
*by A***Z on August 23, 2018*

What I liked:- The osd, showing battery voltage, channel, power output, and on time- it fits on a 30x30 stack- has an mmcx connector- the pigtail it comes with isn’t too long- the vtx can be powered on but shut off the video transmitting- has a pit modeWhat I dislike:- the size, it’s a little bigger than most vtx’s- you cannot control the power output or the channel through smart audio or tramp telemetry- you have to use a control board/buttons to adjust the power output and channelI have not done a flight test with it yet, soon to come.

### ⭐⭐ Seems like a good VTx
*by M***N on April 4, 2019*

I like all the features on this . Favorite channels and smart OSD and a controller for the OSD . I cant seem to pick out the channel I want though . I watched a video and did what he did but I cant get it to scroll through the programed favorites . I can get it to change channels but cant see what im getting and then have to search the channels with my fat sharks then I can see what its on . I get pot luck . Maybe im doing something wrong or maybe some functions arent working right on this . I have also tried to pick a channel in the menu under CH with no success . This would be a cool VTx if I could figure out why its not letting me scroll through numbers . The instructions really suck too and videos on youtube are not much better

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ma/products/90521387-5-8-ghz-fpv-transmitter-25-200-400mw-switchable-video](https://www.desertcart.ma/products/90521387-5-8-ghz-fpv-transmitter-25-200-400mw-switchable-video)

---

*Product available on Desertcart Morocco*
*Store origin: MA*
*Last updated: 2026-02-16*