Usage Tips: The output of the speed controller is DC, which will not damage the governor. The applied voltage range is 9-50V. Features imported special speed drive IC. Thickened copper sheet and PCB balanced layout for heavy current ensure high-efficiency PWM output. Features: - New generation 9-50V 40A DC motor pump speed controller - Controls and adjusts the speed of a DC motor - Lightweight design with high current capacity and wide voltage range - High reliability, high efficiency, high torque, and low heat generation - Enhanced with thickened copper sheet and balanced PCB layout for heavy current performance Specifications: - Operating voltage: DC 10V-50V - Controlled power: 0.01-2000W - Quiescent current: 0.025A - PWM duty cycle: 5%-100% - PWM frequency: 12kHz - Working temperature: -20°C to 40°C - Material: Metal and Plastic - Item size: 12.2 x 5.5 x 3.8cm (4.8 x 2.17 x 1.5in) L x W x H - Item weight: Approximately 137g (4.83oz) - Package size: 20 x 14.7 x 4cm (7.87 x 5.79 x 1.57in) L x W x H - Package weight: 138g (4.87oz) Package List: 1 x PWM DC Motor Speed Regulator Controller Switch Note: Package does not include a user manual.