This is a Hitec HS-6635HB Digital High Torque Servo with S plug. FEATURES: Digital servos offer instantaneous response, precision resolution, and enormous standing torque Dual ball bearings 3-pole ferrite motor Karbonite gears Programmable digital amp Comes with "S" servo plug installed INCLUDES: One servo Hard carrying case Red four way servo horn Black round servo horn Black short straight servo horn Black straight servo horn Four servo grommets Four brass eyelets Four S/T servo mounting screws Decals SPECS: Length: 1.56" (39.8mm) Width: .77" (19.8mm) Height: 1.52" (38.8mm) Weight 1.83oz (52.1g) Operating speed: .18 sec/60 degree at 4.8V, .15 sec/60 at 6.0V Operating torque: 69.43 oz/in at 4.8V, 83 oz/in at 6.0V COMMENTS: This servo can be programmed with the Hitec Servo Tester. For replacement gear set, order HRCM5006. ajw 7-14-04 ir/jxs updt jxs 7/21/04