Features: This is a simple and easy-to-use DC brushed motor speed controller with an elegant appearance and stable performance. The speed controller is made with a high-quality circuit board, ensuring a longer service life. Designed with screw terminals for quick and convenient wire connection. This motor speed controller includes an on/off switch function and supports CW/CCW rotation control. The high-performance DC motor speed controller delivers high power output, low heat generation, high efficiency, high torque, and quiet operation. Specifications: Model: CCM2NJ Working Voltage: 12–40V DC (output voltage range: 0–100% of input voltage) Control Power: 12V = 36W, 24V = 72W, 40V = 120W Rated Current: 3A Maximum Current: 5A Speed Control Range: 0–100% PWM Frequency: 15 kHz Potentiometer: B100K, 8mm shaft diameter Dimensions (L × W × H): 73 × 39 × 31 mm / 2.9 × 1.5 × 1.2 in Weight: 74 g / 2.6 oz (approx.) Package Includes: 1 × Speed Controller Notes: 1. This speed controller is designed for use with DC brushed motors only. 2. It is not compatible with DC brushless motors and cannot be used as a voltage regulator or voltage stabilizer. 3. Units shipped may vary between newer and older versions; please confirm you accept this variation before ordering.