This is the Futaba R7006SB 2.4GHz FASSTest 6+ Channel High-Voltage Full Range Receiver for Aircraft Models.
Bi-directional communication with a FASSTest Futaba transmitter using the S.Bus2 port Multiple optional telemetry sensors may be connected to the S.Bus2 port and the data displayed on the transmitter Includes both standard PWM output ports and S.Bus and S.Bus2 output ports. 6 PWM channels, up to 18 S.Bus channels
Futaba R7006SB 2.4GHz FASSTest Receiver with Instructions
Receiving Frequency: 2.4GHz FASSTest system Power Requirement: 3.7 - 7.4V (voltage range 3.5 - 8.4V) Size: 0.89 x 1.5 x 0.48" (22.5 x 38.3 x 12.2mm) Weight: 0.30oz ( 8.5g)