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Futaba Systems Receiver,
This is the Futaba S-FHSS 2.4GHz S.Bus Port and RSSI Drone Racing Receiver. Specifications Size (0.79 in x 0.39 in x 0.12 in) Weight 2.9g (0.1 oz) Power Requirements DC Battery F/S Voltage 3.8V NOTE Be sure that when using ESC's regulated output, the current capacity of the ESC meets your usage conditions. The battery F/S voltage is set for a 4-cell NiCd/NiMH battery. Battery F/S function doesn't work properly when a different type of battery is used. The can be used with up to 8 channels. The fail safe function can be set for each channel. However, it differs according to

Price is $37.00
Price: $37.08