Ride your Bike as Car Driver:Using Wireless Remote Controller To Control The Picture Displayed On The Tail Light To Perfectly Let The Driver Behind Know Your Purpose. The Displayed Turning Signal (Left,Right And Warning) Allowing Drivers Keep A Safe Distance From Getting Too Close, Protecting You And Your Family By Providing A Safety Distance With Others. USB Rechargeable Battery: Rechargeable rear bike light is very convenient to use, no need to replace the battery frequently. Note: the battery of the controller is not rechargeable, it use battery CR2032 .The controller is energy saving, one battery can last very long time. One more battery is included in the package. CR2032 battery is very easy to find, it?s sold just in a small shop. DIY Picture Display: you can use the provided APP to change the picture displayed on the taillight with any picture, text and your own drawings Easy To Install: Special Silicone Pads fit for almost all seat tubes on the market and Velcro is very convenient to use.