Features: Compatible with for -i10, -i8, -i6, -i6s, -i6x, -i4, -i4x, etc. series RC transmitter. The two-way transmission can detect the battery voltage of the drone. Use the AFHDS 2A protocol and dual omnidirectional antenna with superior noise reduction techniques. Adopted electromagnetic shielding cover to get better signal and performance. Support 6CH PWM, 18CH I.BUS, and 8CH PPM signal output. This -X6B receiver is specially designed for FPV Racing Quadcopter, the size and mounting hole perfectly fit with CC3D, F3, and F4 flight controllers. It is in support of two-way transmission which can detect the battery voltage of the drone. In support of PWM, I.BUS and PPM signal, and dual-antenna design and its electromagnetic shielding cover provide magnificent receiving signal. : Item: -X6B Frequency: 2.4Ghz Mode: AFHDS 2A Range: 500 ~ 1500m (in the air) Signal type: PWM, I.BUS, PPM Channels: 6CH PWM, 18CH I.BUS, and 8CH PPM Input voltage: 4-8.4V Voltage detection: 1-4S Suitable: for 130, 210, 250 wheelbase FPV Racing Quadcopter Due to different batches, the appearance, color and printed words of the product , which will not affect the use. size: 37 x 22 x 7.5mm Material: PCB colour: As Shown Package Contents: 1 x 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.