Description: _x000D_ This is a simple and easy-to-use DC motor speed controller of small size, elegant appearance and stable performance. It is made with high quality circuit board which ensures a longer service life. It support soft start, locked rotor protection, low voltage protection._x000D_ _x000D_ _x000D_ _x000D_ Features: _x000D_ Speed controller is made with high quality circuit board which ensures a longer service life._x000D_ _x000D_ This simple and easy-to-use DC motor speed controller has an stable performance. _x000D_ This motor speed controller uses screw terminals for convenient and quick wiring. _x000D_ Soft start function would protect speed controller and motor against damage from large instant current. _x000D_ It supports locked rotor protection by limiting large current(maximum 30A) instead of cutting off power. _x000D_ If you use a storage battery as power supply, the low voltage(10V) protection function would prevent over-discharge._x000D_ _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Input Voltage: DC10V-55V _x000D_ Output Voltage: Linear with load_x000D_ Output Current: 0A-40A _x000D_ Limit Current: 30A_x000D_ Speed Range: 0% to 100%_x000D_ Regulation Method: Potentiometer(Linear, 270) _x000D_ Control Frequency: 15KHz_x000D_ Wiring Type: Screw terminal _x000D_ Rotary Knob: 10K(with switch)_x000D_ _x000D_ Size: 80 x 56 x 28mm / 3.15 x 2.2 x 1.1" _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Speed Controller