1. With multi-language voice English German French... 2. Waterproof performance reaches IP67 waterproof standard 3. With Bluetooth function and map navigation, you can clearly understand the road conditions on the display screen without looking at your mobile phone during long-distance riding. 4. It has the function of mobile phone information and call reminder display. When Bluetooth is connected to the display, text messages, calls and various information will be displayed on the display. 5. APP supports and Android systems. Ergonomic external button design, easy to operate. Speed display: average speed, maximum speed, speed (real time). Kilometers/miles: can be set according to customer habits. indication: Provides reliable power indication that will not fluctuate with the on/off of the motor. Colour:black Material:plastic type:UART Protocol Package Contents: 1 x Electric Bicycle Display 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.