This is the HS-56HB Feather Servo from Hitec. This version of the servo has a universal connector which will fit Airtronics, JR, Hitec and Futaba receivers (be careful with the polarity of the connector for Futaba radios).
Speed: .12 sec/60 degrees @ 4.8V – .10 Sec/60 Degrees @ 6.0V
Torque: 13.88 oz-in @ 4.8V – 16.66 oz-in @ 6.0V
Weight: 0.37 oz
Length: .88″ (22.6mm)
Width: 0.45″ (11.6mm)
Height: 0.94″ (24mm)