Full Metal Shell High Torque servo More Powerful Brushless Motor Servo.Pins Shaft Gears Upgraded and Stronger.Housing with Added Grooves for more Efficient Heat Dissipation Brushless Servo Maximum Torque of 61 kg-cm (847 oz-in) (8.4 V) and Speeds Up to 0.09 sec/60° (8.4 V) Full Metal Shell /Digital / Brushless/Waterproof IP67 / Metal Gears / Full Ball Bearings / Shockproof High Voltage 4.8V - 8.4V RC Servo Controllable Degree Range 0-180° when 500-2500μsec RC Servo Standard Size is 40*20*38mm (1.57*0.79*1.49in) Best for 1/8 1/10 1/12 RC Cars, Boats, Robot & Planes Electrical Specification Operating voltage range: 4.8-8.4 Volts Operating speed at no load ( 4.8V ): 0.14 sec/60° Operating speed at no load ( 7.4V ): 0.10 sec/60° Operating speed at no load ( 8.4V ): 0.09 sec/60° Stall torque at locked ( 4.8V ): 39kg.cm(541oz-in) Stall torque at locked ( 7.4V ): 55kg.cm(763oz-in) Stall torque at locked ( 8.4V ): 61kg.cm(847oz-in) Stall current at locked (4.8V ): 3.2A Stall current at locked ( 7.4V ): 5.2A Stall current at locked ( 8.4V ): 6.2A Idle current at stopped (4.8/7.4/8.4V): 5mA Control Specification: Control System: PWM (Pulse width modification) Pulse width range: 500-2500μsec Neutral position: 1500μsec Running degree: 180° (when 500-2500μsec) Dead band width: 2μsec Operating frequency: 50-330Hz Rotating direction: Counterclockwise (When 1500-2500μsec) Product Specification: Suitable for: for 1/8 1/10 1/12 Scale RC Cars, Trucks Limit angle: 360 degree servo Bearing: 2BB Horn gear spline: 25T Diameter:5.9mm Case : Engineering plastics+Aluminum alloy Motor: Coreless brush motor Spline:25 Tooth Gear ratio: 342 Bearing：Double Bearing Waterproof Performance：IP67 Connector Wire: 12.6in (320mm) Size: 1.57*0.79*1.59inch（40 * 20 * 38.5mm） Weight: 2.11oz (60g) CE /RoHs: Yes Apply Environmental Conditon: Storage Temperature Range:-30°C~80°C Operating Temperature Range:-25°C~70°C Packing List: 1 x BLS3355 55kg Servo (180°) 1 x 25T Adjustable Metal Servo Arm 1 x Accessories Set (As Shown on The Picture)