1、BT LED SCREEN: 12 x 48 dot LED screen, color LED, very fashionable, BT connected to your smartphone (for IOS 8.0 and for Android 4.3 or above), application programmable graphics, text, graffiti, rhythm, user friendly. Please do not use the BT connection of your phone directly, as connecting directly may result in error messages. Please run the app and connect BT from it. 2、EASY TO USE: Download the for SPOTLED application from the for ios App Store or scan the QR in the user manual, long press the power button to activate the LED screen, and connect to the BT hotspot of the phone. In the application, you can enter text or your own DIY graffiti style to attract everyone's attention. 3、LARGE FIELD OF VIEW: 180 degree field of view width, visibility up to 150 meters, 8.86 x 2.17 x 0.59 inch (225 x 55 x 15mm) color LED screen, bright bike tail lights, even in foggy, rainy, and even pitch dark nights, can be seen from 150 meters away. Provide you with ultra high brightness without dazzling. 4、4 MODES OF REMOTE CONTROL: The remote control on the handle is convenient for cyclists to control during cycling. Suitable for mountain bike, and road cycling. 4 modes, left turn light, right turn light, left and right traffic light, DIY design light. 5、WIDELY APPLICABLE: 1500mah battery with ultra long battery life. Install the LED sign on your bike, helmet, scooter, stroller, wheelchair, or anywhere you can imagine. Strengthen the safety factor of night travel.