This is a High Speed Digital Servo. It is designed to work with 550-700 Helicopters.

Features:
High Speed
Metal Gears

Specs:
Operating voltage range 4.8V-8.4V
Operating speed :
0.07sec@60°//6V
0.06sec@60°/7.4V
0.05sec@60°//8.4V
Torque :
5.5Kg-cm @ 6V
6.5Kg-cm @ 7.4V
7.5Kg-cm @ 8.4V
Weight 68g
Working Frequency:760us
Ball Beaing : 2BB
17mm Coreless Motor
Size:40.5*20*37mm