These inline dimmer switches offer a low-profile way to control LED strip lights. Choose from 8 levels of brightness, turn lights on or off, or choose a dynamic mode for added effect. Installation is simple, just connect it between the driver and the strip. Use this with strip lighting that uses a barrel connector, such as single color ABI LED strip light kits. To turn it on quickly press the middle button. To turn it off press and hold the middle button. To enable standard dimmer mode, press the lower button once, then you can press the middle button to increase brightness or press the lower button to lower brightness. To enable one of the dynamic modes press the top button. There are five dynamic modes. Switch between them by pressing the top button. The speed of the dynamic modes can be adjusted by pressing the middle button. To exit dynamic mode, click the lower button once which switches it back to standard dimmer mode. Features and Specifications: Voltage: 12V-24V Max Load: 12A (144W) Dynamic modes: gradual change, signal light, strobe, breathe, candlelight Retains setting after power loss Dimensions: 260mm Color: Black Package include: 20 x Low-profile Inline Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.