Check the listing for details. PWM DC Motor Speed Regulator Adjustable Speed Control Switch 12V 24V 36V 10A. Condition: New. Listed at 8.98 USD. Package: 1 DC Motor Speed Controller Features: CCMHC DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). Input supply voltage range is 12V-40VDC. The maximum output power : 400W(the power is 12V * 10A =120W ... 24V maximum power of 200W) PWM frequency is 21KHz ; Adjustable speed range is 5%-100%. Incorporate a 10A fuse, and with the protection function of reverse connect power supply. Suitable for the DC motor (or DC load) within 8A, Peak current 10A. Item size: 2.36*2.17*1.1 inches ; Net Weight:2.4 ounces. Operating instruction: Before you attempting to wire the controller, make sure power is off. WARNING: TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR. 1. Connect wires refer to the “wiring diagram” 2. Turn on the power, and adjust the potentiometer. 3. If you need to connect the potentiometer by wire, remove the potentiometer on the board, and connect it to the white 3-pin header. Contact Us (1) We strive to provide the best service as possible, commit to resolve all problems and give fast shipping. (2) Please contact us before giving any negative feedback. If you have any questions, please do not hesitate to contact us. Payment (1) All payments must be prepaid and cleared. (2) We only accept Paypal payment. After checkout, please make through Paypal service. Shipping (1) Buyer is responsible for any incorrect address and undeliverable address. We reserve the right to charge the shipping fee again for returned items due to wrong address. We take the paypal address as your shipping address. Please make sure your shipping address is correct during check out. (2) Your order will be shipped within 24 hours after payment is cleared (Sat. & Sun. excluded and holidays) (3) We ship orders using USPS (United States Postal Service). The shipment usually takes 2-4 business days, excluding holidays, Saturday and Sunday (4) Local pick up is not available. (5) No International Shipping. Warranty (1) This product has a 30-day warranty. (2) Warranty does not extended to any products that are buyer's negligence, abuse, misuse, improper installation or physically damaged on the buyer or user's part. (3) Please contact us before making a replacement or refund. (4) In case of returning, buyer must pay their own postage and shipping fees for replacement or refund. We will provide replacement or refund after product is received.