This is the Futaba R6203SB 2.4GHz FASST S.Bus High-Speed 3-Channel Receiver.

FEATURES: Ideal for use with the 3-axis CG750 gyro or any S.Bus application
Utilizes digital serial data communication technology to transmit
control signals between the receiver and servos using S.Bus hubs
and cables (available separately)
Three "normal" channels and one S.Bus channel allowing as many
channels as the transmitter has available whe using S.Bus
equipment
Full-range FASST receiver with dual antenna diversity
High-voltage capable
Easy programming with the SBC-1 Channel Setting Tool (FUTM4190),
S-Bus receivers or PCLink software
SBD-1 decoder cables (not included) allow the use of existing
analog and digital servos
Prevents mismatched servo/channel connections
One year limited warranty through Hobby Services beginning at date of
purchase

INCLUDES: Futaba R6203SB 2.4GHz FASST 3/18 Channel High-Speed Micro Receiver
with Instructions

REQUIRES: Linking to transmitter and setting servo channels following
instructions in manual

SPECS: Power Requirement: 3.7V or 7.4V battery or regulated output from ESC*
*output capacity must meet usage condition
Voltage Range: 3.5V - 8.4V
Dimensions: 0.89 x 1.47 x 0.37" (22.5 x 37.4 x 9.3mm)
Weight: 0.25oz (7.2g)