With unmatched reliability and reduced interference, it features cutting-edge diversity technology and a built-in temperature compensated crystal oscillator (TCXO) to stable frequency at different temperatures. Dual antennas improve signal stability and signal reception range, presenting excellent signal sensitivity and signal-to-noise ratio. Designed to integrate seamlessly with the for Heli flight controller, it can improve your control accuracy, making it an ideal choice for amateurs and professional pilots. With battery voltage feedback function, it is suitable for ESCs without voltage feedback function. The small and form factor makes it a great choice for small models, minimizing weight without sacrificing performance. Item: RP3-H ExpressLRS 2.4GHz Nano Receiver Type: ISM MCU: ESP8285 RF Chip: SX1281 Telemetry RF power: Max 100mW Antenna: 150mm 2.4GHz Antenna x2 Frequency Range: 2.404 - 2.479 GHz Maximum receive refresh rate: 500Hz / F1000Hz Minimum receiver refresh rate: 25Hz Working voltage: DC 4.5 - 8.4V Battery voltage detection range: DC 4.0 - 35V Firmware Version: ExpressLRS v3.3.1 pre-installed Bus interface: CRSF/S.Bus The product appearance and printed words depending on the batch, but this does not affect use. Colour:Black Material:ABS Package Contents: 1 * ELRS 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.