Bind procedure: 1. Supply power to the EP1 rx, wait until the LED on the RX is off, immediately turn off the power, and then repeat again the above steps. When the RX is powered on for the third time, the LED light to double-flash, which means that the RX enters the binding mode 2. Insert the ES24TX module or other DIY 2.4G ELRS TX to Radio transmitter, and choose External mode to CRSF protocol, then you can find ELRS menu from the (Need to copy the ELRS.LUA file to the SD-Card tools first), Enter into ELRS and [Bind], the LED on the RX module to be solid if bind successfully. 3. Receiver LED status meanings: EP1 RX: LED solid means bind successful or Connection established; LED double-flash means in bind mode; LED flash slowly means no signal connection from the TX module; LED flash fast means in WIFI hotspot mode, you can connect the WIFI of the RX and upgrade firmware of the RX via visit 10.0.0.1(password:expresslrs) EP1_RX Type: ISM ESP8285 MCU SX1280IMLTRT Module Omnidirectional antenna Frequency Range: 2400 MHz to 2500 MHz Maximum receive refresh rate: 500Hz Minimum receiver refresh rate: 25Hz Working voltage: 5v Weight: 0.42gram(without antenna) Dimension: 10mm x 10mm x 6mm gain: 2.23dB Material: PCB colour: black Package Contents: 1 x Receiver 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.