Package Includes: (1) Single Color LED Light Strip Roll Dimmer Inline w/ DC Plug Ends 12V-24V White Features: For single color LED light strips. Color: Black or White Working voltage: 12-24V DC MAX output current: 12A, 144W Working temperature: -30 C to 75 C Size: about 42 x 12 x 7 mm Overall length: about 23 cm Buttons: MODE: Press this key to switch between dynamic effects. LIGHT: Steady on SPEED/BRIGHT: Press to adjust the speed of dynamic mode. Adjust the brightness of the light strip while under LIGHT mode. Instructions: 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.