Power input:5v Working current:about 100Ma Working protocol:CSRF Weight:0.6 grams (without antenna) Antenna terminal:IPEX1 ES900RX receiver frequency binding steps: 1. Power on the ES900RX receiver, turn off the power immediately when the LED on the receiver goes out, and then repeat it again. When the ES900RX is powered for the third time, the LED on the receiver start to flash twice, which means that the ES900RX receiver enters the frequency binding mode. 2. Connect the ES900TX or ES915TX high-frequency head module, select the CRSF protocol in the remote control module options, then find the ELRS option, enter and select BIND. After the frequency is successfully bound, the LED on the receiver turn off first, then flash slowly and then stay on. Telemetry output power:Less than 17dBm Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Receiving frequency range:915MHz Colour:Black Material:PCB Package Contents: 1 * ELRS ES900RX RX FPV 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.