Number of channels: 7CH Working voltage: 4-6V Protocol: PWM/CRSF switchable 7-channel full-scale ELRS 2.4G receiver Switchable CRSF bus mode without re-flashing the firmware Type:ELRS24G PWM 7-channel receiver Firmware model:DIY2400RX PWMPEX Antenna:IPEXMHF+T antenna/copper tube antenna Microcontroller chip:ESP8285 RF chip:SX1280/SX1281 Return power:12.5DBM/17MW Firmware version:EXPRESSLRSV3.2 Weight:3.5G Note: The factory firmware is 3.2.0. If your tuner firmware is lower than version 3.0, it is recommended to update to 3.2.0 to use 7 PWM full-ratio channels. 2.X only has 4 full-ratio channels. Due to different batches, the appearance, color and printed words of the product , which will not affect the use. Type: Colour:Black Material:PCB Size:Circuit board size:18.5MM x 26MM Package Contents: 1 * Receiver 1 * T antenna 1 * copper tube antenna 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.