This is the HS-5045HB Digital Sport Micro Servo from Hitec. FEATURES: Ideal for 200mm class Micro-Helis, 2M sail planes, small electric park flyers and 1/18 scale cars and trucks Standard programmable circuit, programmable features include; Dead Band Width Speed (reduction) Fail Safe Position Direction (CW/CCW) Fail Safe On/Off End Points Advanced Gear Train Technology (AGTT)-extra thick Karbonite gears on longer flexible shafts that run the entire length of the case, stronger than standard nylon gear micro servos INCLUDES: HS-5045HB Digital Sport Micro Servo, 0.67" (17mm) four-point horn, 2.1" (54mm) straight horn REQUIRES: Installing in model and connecting to control linkage and receiver SPECS: Size: 0.92 x 0.38 x 0.88" (23.3 x 9.6 x 22.3mm) Weight: 0.29oz (8.2g) Speed: 0.10 sec @ 6V Torque: 17 oz/in @ 6V Drivetrain Type: Top ball bearing jxs 7/13/09 ir/jxs