Hitec D840WP Giant Digital Cored Servo 227g 30kg/0.11s 4.8V - 7.4V 2221302Hitec D840WP Giant Digital Cored Servo 227g 30kg 0. 11s 4. 8V 7. 4V 2221302 A programmable, 32 bit, multipurpose, waterproof, steel gear, mega scale servo Part of Hitec's D Series servo range, the steel gear D 840WP 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