Futaba brand Futaba BLS255HV High Voltage High Speed Digital Servo. FEATURES: Ideal for swash plate control on flybarless CCPM helis Dual bearings and metal gears for smooth, long-lasting operation Handles up to 2S LiPo battery power One year limited warranty through Hobby Services beginning at date of purchase YOU WILL RECEIVE: Futaba BLS255HV Servo 0.83 (21mm) Diameter Round Horn 1.8 (45mm) Diameter Round Horn 1.6 (38.5mm) Diameter 4-Point Horn 1.2 (32mm) Diameter 6-Point horn Mounting Hardware REQUIREMENTS: Installing in heli, connecting linkage and connecting to receiver SPECIFICATIONS: Speed: 0.10 sec/60 at 6.0V 0.08 sec/60 at 7.4V Torque: 147.2 oz/in (10.6 kg/cm) at 6.0V 166.7 oz/in (12.0 kg/cm) at 7.4V Size: 1.57 x 0.79 x 1.45 (40 x 20 x 36.8mm) Weight: 2.12oz (60g) Power Supply: 6.0 - 7.4V DC COMMENTS The BLS255HV is designed for high torque/high speed applications. Very high current drain is normal at startup. Always use a 6V - 7.4V battery. jxs 05/27/11 ir/jxs