ExpressLRS is designed to provide the best fully open, high-refresh radio control link while maintaining the maximum achievable range of rates at low latency. ELRS 915M NANO PRO, based on ExpressLRS open source system, ESP8285 +SX1276+500mwPA receiver, operating frequency configurable to 915MHZ, WIFI upgrade support, and with 500mw back power. It can provide more than 50km long distance backtransmission, and uses the small size of 11mm x18mm nano receiver. Model:ELRS 915M NANO PRO Frequency:915 MHZ Chip:SX1276 + ESP8285 Telemetry power:500mW Rf connector:IPEX 1 Input voltage:4.0-5.5V Weight:0.6 g (receiver only) Due to different batches, the appearance, color and printed words of the product may vary, which will not affect the use. Colour:Blue Material:PCB Size:11 mm x 18 mm Package Contents: 1 * For BAYCK ELRS 915M NANO PRO Receiver 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.