MCU:ESP8285 Antenna interface:IPEX 1 Telemetry power:Max 50mW Max Air Rate : 200Hz Min Air Rate : 25Hz Voltage range: 4.5-8V LED Status: Slow blink 500ms on/off--Waiting for connection from transmitter Fast blinking 25ms on/off--WiFi mode enabled Medium speed blink 100ms on/off--Radio chip not detected Double blink then pause--Binding mode enabled Triple blink then pause--Connected to transmitter but mismatched model-match configuration Solid on--Connected to a transmitter, or bootloader mode enabled (Due to different product batches, the appearance may vary, which does not affect the use) Material: PC+Plastic colour: Black Specification: B Package Contents: 1 x Receiver(868MHz) 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.