The digital version of our popular HS-645 is the HS-5645MG, featuring a programmable digital circuit and our custom MP/metal gear train technology. Perfect for larger airplanes and heli’s, the HS-5645MG will deliver higher resolution and torque than its analog brother. Note: Metal Horn (R-ML) Included Features Top Selling High Torque Standard Digital Servo Strong Three-Pole Ferrite Motor Metal Gear Train with MP Gear Technology Dual Ball Bearing-Supported Output Shaft Standard Programmable Digital Circuit Provides Fine Resolution and Centering Specifications Motor Type: 3 Pole Bearing Type: Dual Ball Bearing Speed (4.8V/6.0V): 0.23 / 0.18 Torque oz./in. (4.8V/6.0V): 143 / 168 Torque kg./cm. (4.8V/6.0V): 10.3 / 12.1 Max. Voltage: 6.0V Size in Inches: 1.59 x 0.77 x 1.48 Size in Millimeters: 40.39 x 19.56 x 37.59 Weight ounces: 2.11 Weight grams: 59.82