This is the Hitec D845WP Waterproof Monster Torque Steel Gear Large Scale Servo. The steel D-845WP is part of the D-Series servo line. All Hitec D-Series servos have been designed Hitec's cutting edge, custom engineering. Combining industry leading high-resolution, state-of-the-art ultra-response technology with a 32-bit MCU and 12-bit ADC for unprecedented programmability and flexibility, these servos deliver significantly smoother movement. The speedy, powerful line operates on a wide 4.8 ~ 8.4 voltage range, allowing use with any common battery chemistry without the need for adapters or regulators. Featuring a 15 tooth HD output spline with 3mm hex screw, each D-Series servo brings monster performance never known before in the market. NOTE: Losi Desert Buggy XL applications will require shimming at the servo or the servo tray, to raise the servo high enough to clear the chassis. Features: Programmable PWM Digital Amplifier 32-Bit MCU with 12-Bit ADC Circuitry 4096 Resolution 1M Cycle Long Life Potentiometer Wide Operating Voltage (4.8 ~ 8.4 Volts DC) Dual Ball Bearing Supported Output Shaft 15-Tooth 8mm Output Spline Coreless Metal Brush Motors Nylon Reinforced Plastic Upper and Lower Case Diamond Cut Aluminum Heat Sink Center Case IPD 67 Rated Water Resistant and Waterproof Proof Case Programmable Functions: End Point Adjustments Direction Fail Safe Dead Band Speed (Slower) Soft Start Rate Overload Protection Data Save / Load Program Reset Accessories: Steel Gear Set Metal / Plastic 1st Gear Set Plastic / Aluminum Case Set Specifications:Operating Voltage Range (Volts DC): 4.8V ~ 6.0V ~ 7.4VSpeed (Second @ 60°): 0.26 ~ 0.21 ~ 0.17Maximum Torque Range oz. / in.: 454 ~ 566 ~ 698Maximum Torque Range kg. / cm.: 32.5 ~ 40.5 ~ 50.0Current Draw at Idle: 30 mANo Load Operating Current Draw: 1,600 mAStall Current Draw: 10,000 mADead Band Width: 2 µsDimensions (Inches): 2.59 x 1.26 x 2.44Dimensions (Metric): 66.0 x 32.0 x 62.0Weight (Ounces): 8.0Weight (Gram): 227.0Circuit Type: 32bit Programable DigitalMotor Type: 5 Poles Cored Metal BrushGear Material: SteelBearing Type: Dual Ball BearingOutput Shaft (type / Ømm): 15T 8mmCase Material: Plastic / AluminumDust / Water Resistance: IP 67Connector Gauge (AWG) / Strand Count: 20 / 80Limited Warranty:Hitec Servo Warranty: Each Hitec servo is backed by a limited two-year warranty from the date of purchase. Hitec RCD USA, INC. shall REPAIR OR REPLACE, at Hitec RCD, INC., defective equipment covered by this warranty, otherwise the purchaser and/or consumer is responsible for any charges for the repair or replacement of the product.