This Item is comes with three Battery,
Name: 7LED sided double sense (with adapter)
Power: 3 AG10 button batteries (included)
Features: It is sense by shock / vibration and it is very sensitive. When you are not riding, the LED will off automatically. you will save a lot of battery.
Description: water Proof, mouth applicable US and British mouth , it need to install the conversion. Now on the market are selling one-sided LED, you can only to see side. BUT our latest product that is double-sided. When you ride, people can see both sides of the words
此款自带3块电子，
品名：7LED双面双感适合美嘴 英嘴（带转接头）
供电：3个AG10纽扣电池，本产品已含在内。
特点：双感（感光+感震）
简介：生活防水，美嘴适用，英嘴法嘴需安装转换嘴。现在市场上都是单面的，只能看一面。而且我们的这个最新产品是双面的。在您骑车时，路两面的人都能看到显字
