Futaba R334SBS 4 Channel T-FHSS SR S.Bus 2.4gHz Receiver Suit 7PX and 7PXR

Designed for use with Futaba surface transmitters using TFHSS and
TFHSS-SR technology
TFHSS bidirectional telemetry
Programmable and compatible with S.Bus2 systems
Normal/high-speed modes (auto detection), normal mode accepts any
type of servo, high-speed mode only accepts digital servos
including BLS servos
High voltage
Dual antenna diversity
Battery fail safe
One year limited warranty through Hobby Services beginning at date of
purchase

Specs:

Operating Voltage: 3.7-7.4V
Size: 1.3 x 0.88 x 0.44" (33.9 x 22.3 x 11.3mm)
Weight: 0.26oz (7.3g)