Hitec HS-646WP Std Size Waterproof Servo (High Voltage)Features Industry's First IP67Rated Waterproof Case * IP = International Protection Code | 6 = Dust Tight | 7 = Immersion up to 1M Strong ThreePole Ferrite Motor Metal Gear Train with MP First Gear Dual Ball BearingSupported Output Shaft 7.4v 2Cell LiPo Capability Programmable Circuitry Our waterproof servos have what it takes to keep your radio control vehicle, airplane or robot watertight! With high torque, dual ball bearings and metal gears, our analog waterproof servos have the industry’s first IP67* rating ranking them among the most durable and reliable servos for wet conditions. Whether you are manning your power boat, bashing in the mud, directing your underwater robot, or water landing your 25% plane, the HS-646WP will dependably keep your mind at ease.