1、Bluetooth LED Screen: This bike turn signal features 12 x 48 dot matrix LED logo screen, with yellow LEDs, which is very stylish, and connects to your smartphone by bluetooth (for ios 8.0 and for android 3 and above), the app can be programmed with patterns, text, doodles. 2、Easy To Use: This bike turn signal is very easy to operate, you just need to download the for SPOTLED app from the for Apple app store or scan the QR code in the user manual, long press the power button to activate the LED screen and connect it to your phone's bluetooth hotspot. 3、Large Vision: This bike turn signal has a 180 degree field of view width, visibility up to 150 meters, the 7.68 x 18 x 0.59 inches (195 x 30 x 15mm) yellow led screen is bright enough to be seen up to 150 meters away, even in foggy or rainy weather, or even in the pitch black night. 4、4 Modes Remote Control: This bike turn signal has a remote control with four adjustable modes and can be mounted on the bike handlebars for easy control. 5、Wide Application: This bike turn signal can be used for bikes, helmets, skateboards, scooters, strollers, wheelchairs, or anywhere you can imagine. 1 x LED Screen2 x Screw2 x Nut1 x Cross Screwdriver1 x USB Cable3 x Light Stand Part1 x Remote Control1 x Hook Item Type: Bike Tail LightMaterial: ABSScreen Battery: 1 x 602040 Polymer Lithium Battery 450mah ( Shipped With Built In Battery )APP: for SPOTLED APPConnection: BluetoothRemote Control Battery: 2 x 3V 75mAh CR2016 Button Battery ( Shipped With Built In Battery )