D645MW Wide Voltage Super Torque ServoDescription Part of Hitec's D Series servo range, the metal gear D 645MW features industry leading high resolution, state of the art ultra response technology, a 32 bit MCU, and a 12 bit ADC for unprecedented programmability and flexibility. The result is a significantly smoother movement and a 4. 8 8. 4 volt range, allowing use with any common battery chemistry without the need for adapters or regulators. Featuring Hitec's industry standard 25 tooth