This bike is an for your riding.With multiple functions, 2.8in LCD backlight and rechargeable. 

Features:
A / B selectable, buttons control for easy operation. 
Multifunctional, includes all vital functions for novices and pros alike.
LCD display with back allows you to read riding data easily and clearly during night trip.
and waterproof for use in all conditions.
Easy installation, no tools required.

Specifications:
Color: Black
Material:
: Rechargeable 250mah  
Style:
Watertight: IP4
Item Size: 9*5.3*2.2cm /  3.5*2.1*0.9in
Weight: 53g / 1.9oz
Package Size: 10*13*5cm /  3.9*5.1*2.0in 
Package Weight: 120g / 4.2oz

Package list:
1 * Bike
1 * Bracket
1 *
1 *
1 * Type-c USB Cable
1 * Manual