Easy to bind and very fast link-up, quick and extremely stable in performance. Ultra-small size and ultra-light weight, effectively save space and reduce item's weight-bearing Buillt-in gyroscope features automatic recovery of unexpected offsets Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use.<br><br>-BS4 Receiver Channels: 4CH -BS4 Receiver Wireless frequency: 2.4GHz -BS4 Receiver Wireless protocol: AFHDS 2A -BS4 Receiver Data port: PWM / PPM / i.bus / s.bus Material: plastic colour: light blue + black<br><br>Package Contents: 1 x receiver<br><br>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.