Contact with us before place an order. Make sure battery was closed up when you connect or disconnect display, otherwise it may will damage the display. Features 1 High-contrast 3.5inch IPS colorful matrix screen. 2 Suitable for low temperature, Max -20? 3 The screen can be freely switched horizontally and vertically.4 Speed display : AVG SPEED, MAX SPEED, SPEED(Real-time). 5 Kilometer / Mile : Can be set according to customers' habits. 6 Adjusting 5 levels backlight brightness:1st level is the darkest, 5th is the lightest. 7 9-level Assist : 3-level/5-level/6-level/9-level is optional. 8 Mileage indicator : Odometer/Trip distance/ Clock/ Riding time. 10 Speed limited can be setted. 11 USB charging port, 500mA/5V. A: If you don't have any knowledge on electric kits assembly, pls. Thank you for your understanding. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Electric Bicycle Components". The seller is "we_make_goods" and is located in this country: CN. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.