Usage Tips: Undervoltage Protection: When the battery voltages drops to the Undervoltage level of the DC Motor Speed Controller, it automatically stop output, protects the battery in time, and protects the battery pack from being damaged by over discharge.Fault Protection Function: Avoid the flying phenomenon caused by the controller's powering due to line or handlebar failure, and improve vehicle security.MOS Tube Short Circuit Protection: Automatically check MOS tube failure when powered toavoid chain short circuits and damage to other MOS tubes.High Temperature Protection: When the Motor Brush Controller's temperature is too high, it automatically reduces the output current or stop the output.Stall Protection: When the motor is stalled, the control cap automatically limits the current and automatically cuts off the circuit 2s after stalling to protect the motor and controller in time. Specification: Material: Aluminum ShellPower: 1000W Size Chart: 9.4cmx6.2cmx3.1cm/3.70inchx2.44inchx1.22inch Package Includes: 1Set Motor Brush Controller Note: Please allow slightly errors 1-2cm differences due to manual measurement.