Key Features Steel Gears 32-bit MCU and 12-bit ADC Plastic and Aluminum Case 15-tooth HD output spline Overview The steel D-840WP is part of the Hitec D-Series dynamo servo line. All Hitec D-Series servos have been designed using brand new, 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 Hitecâs industry standard 25-tooth output spline with 3mm hex screw, each D-Series servo brings monster performance never known before in the market. Specifications: Servo Type: Digital Servo Size Category: Standard Large and Giant Scale Bushing Or Bearing: Bearing Torque: 264 oz-in @ 4.8v, 333 oz-in @ 6.0v, 417 oz-in @ 7.4v Connector Type: Universal Programmable: Yes Servo Operating Voltage: 4.8 - 8.4V (HV) Gear Type: Metal Speed: .17 @ 4.8v, 0.14 @ 6.0v, .11 @ 7.4v Bearing: Dual Product Width: 1.26 in (32mm) Maximum Servo Torque: 350-499 oz-in Maximum Servo Speed: 0.100-0.149 sec Product Length: 2.44 in (62mm) Product Weight: 8.0 oz (227g) Product Height: 2.60 in. (66mm) Shipping Dimensions: Depth : 3.90 in Width : 3.10 in Height : 2.00 in Weight : 0.60 lb