Features: Receivers are based on ExpressLRS open-source architecture and programs, we 3 Types of RX receiver modules are released. Both use ESP8285 MCU.you Firmware can be upgraded via WIFI, which is very friendly. Usually, you just give the receiver After the power is supplied and the remote control is turned off, the ExpressLRS can be found hot after 60 by default.Click, connect to this hotspot through a computer or mobile phone, the password is expressers, Then you can visit 10.0.0.1 to upload the receiver firmware. The appearance, color, and printing of the product from batch to batch, but this does not affect use. ELRS MINI 1: Type: ISM ESP8285 processor 2.4GHz Omnidirectional T Antenna Frequency range: 2400 MHz to 2500 MHz Receiving refresh rate: 500Hz_upper limit Receiving refresh rate: 25Hz lower limit Working voltage: 5V Working Agreement: CRSF(Betaflight) Material: PCB colour: Black Package Contents: 1 x Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.