This is a High Speed Digital Servo. It is designed to work with tail servo for 450/500 Helicopters.

Features:
High Speed
Metal Gears

Specs:
Operating voltage range 4.8V-8.4V
Operating speed :
0.05sec@60°//6V
0.04sec@60°/7.4V
0.035sec@60°//8.4V
Torque :
3.8Kg-cm @ 6V
4.8Kg-cm @ 7.4V
5.5Kg-cm @ 8.4V
Weight 40g
Working Frequency:760us/560Hz
Ball Beaing : 2BB
15mm Coreless Motor
Size:35.5*15*32.70mm