Powerful start, climbing power and small motor noise. When the battery voltage become lower, the current will also become lower to keep normal running. It only protect the battery and extend the battery life, but also increase the running distance. Production technical of Controller and authentic quality. When the motor phase is failure, controller will protect it, avoid motor burned, and protect the battery at the same time. Name: sine wave controller Rated power: 1000 (w) Working voltage: 60-72 (V) Current:32A Colour:black Material:Plastic + Metal Package Contents: 1 x sine wave controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.