This is the Futaba R7006SB 2.4GHz FASSTest 6+ Channel
High-Voltage Full Range Receiver for Aircraft Models.

FEATURES: 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

INCLUDES: Futaba R7006SB 2.4GHz FASSTest Receiver with Instructions

SPECS:    Receiving Frequency: 2.4GHz FASSTest system
Power Requirement: 3.7 - 7.4V (voltage range 3.5 - 9.4V)
Size: 0.89 x 1.5 x 0.48" (22.5 x 38.3 x 12.2mm)
Weight: 0.30oz ( 8.5g)