R404SBS-E– F-4G Telemetry receiver (indoor optimized) High Speed Response System For EP Car Models (01102363-1) F-4G SIZE: 1.00×0.81×0.42 Inch 25.5×20.7×10.6 mm WEIGHT: 5.7 g 0.2 oz OPERATING VOLTAGE: DC 3.7V-7.4V SR MODE SERVOS MUST BE USED WHEN USING SR MODE. USE OF NORMAL SERVOS MAY CAUSE SERVO TROUBLE NEVER USE THE R404SBS-E IN GP CARS