Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience 'brown-outs' where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver smoothing the current delivery. However, in some cases, you may need to install an external BEC. The Power HD 1900MG is a high-quality servo with a torque of 1.5 kg-cm (20.8 oz/in) at 6.0V and a speed of 0.08 sec. It operates at a voltage range of 4.8 ~ 6.0 DC Volts and weighs only 14.0 g (0.49 oz). It features a DC Motor and Copper Gear Type. FeaturesMicro sized for small applications. Copper gears. Fast speed of 0.08/sec at 6V. How To: Install a ServoIn this video, Hamish gives a step-by-step guide on installing a Servo and how to avoid stripping your servo gears. Servo Dimensions Total Height (A ) = 30mm. Body Width (B ) = 23mm. Below Mount (C ) = 16mm. Above Mount (D ) = 14mm. Total Length (E ) = 32.5mm. Total Width (F ) = 12mm. SpecificationsTorque(4.8V): 1.2 kg-cm (16.6 oz/in). Torque(6V): 1.5 kg-cm (20.8 oz/in). Speed: 0.11 sec (4.8V) | 0.08 sec (6V). Operating Voltage: 4.8 - 6V. Weight: 14.0g (0.49oz). Bearing Type: N/A. Motor Type: Brushed. Operating Temperature: -20?~60? . Refresh Rate: 50 Hz. Size: 23.0x12.2x27.5mm (0.91x0.48x1.08 in). Included itemsDescription. QTY. Micro 1900MG 1.5kg Metal Geared Servo. 1.