2PCS PWM Regolatore di Velocità Motore DC4.5V-35V Velocità Regolabile Interruttore Modulo Spe
You can adjust the duty cycle at will to achieve the purpose of speed regulation, small size, with mounting holes, easy to install. PWM Frequency: 20kHz. Otherwise, it will be burned out. Adjustable speed range: 1-100 percent.