This 12V Inline Rocker Switch is an ideal item for controlling LED Strip Lights on and off. It uses a standard 5.5 x 2.1mm DC barrel plugs to fit in between your 12V DC power source and an LED Light Strip with no cutting or wiring needed!Simply plug one end to the power supply. Product Features: Standard 5.5 x 2.1 mm DC Jack .Package Content: 4 pcs x Inline On/Off Rocker Switch , there are two different sizes of 5.5mm DC barrel jacks. Both are the same outer diameter, but one kind has a 2.1mm inner pin diameter, and the other 2.5mm. This product is only compatible with the 2.1mm pin size. 1 Year Warranty .