Description: 【Electronic Stepless Governor】: 12V, suitable for lights dimming, pump regulation, fans wind speed, heating plate, equipment power, motor rotate speed. 【Quality and Durable】: DC Motor Speed Controller Using pure copper thick wire, more safe and stable, waterproof and durable. 【Easy to Use】: Electronic Stepless Speed Regulator Switch With stepless temperature control knob, 25% - 100 adjustable and closed. 【Advntage】: Fans Speed Regulation Silent work, energy saving, stable anti noise, and with wide range of use. 【Wide Application】: Connect this Speed and Brightness Regulator Switch with lamp or home appliance in a series connection, then rotate the knob for dimming, speed, voltage, temperature control. Specification: Material: Copper Operating voltage: 10-14 V Control power: 50W Adjustment range: 25%-100 (can be shut off) Size Chart: 5*2.3*1.9cm/1.97*0.91*0.75inch Package Includes: 1 Piece Speed Controller Note: Don't use it on brushless type motors.