Welcome to our store！</br> 1、[Safe bicycle wheel light]: Press button to select modes: Long light/Breathing light/Slow flash/Rapid flash. With our bike wheel lights , you will gain increased visibility from all directions, no more SIDE COLLISION, improve your safety in low light conditions. 2、 [Smart light sensitive]: Automatically lights off to save energy in the daytime, and lights up automatically riding in the dark. It lights off automatically when your bike stands still for 30 seconds. After closing it manually, it will not light up automatically. 3、 [Independent Electrode Design]: Separate design, just by aligning the two electrodes together, and you will be the coolest one in the dark. 4、 [USB Rechargeable]: No need to remove the lights off you bike when charging. The USB cable is 50 cm, more convenient for you to charge. You can also charge it by your power bank when in biking journey. 5、 [Easy to Install and Remove]: Safe, bright, easy to install with only a screw-driver. Size: about 95*35*13mm Material: PC Weight: about 90g Battery: 230mah lithium polymer battery Charging method: USB charging Features: Automatic shutdown when parking, automatic opening when riding at night, and light sensitivity during the day. Instructions for use: 1. Put the lamp in the wheel spoke. 2. Fasten the lamp on the hub in the middle of the wheel and tighten the screw. 3. Charging: You can directly plug in the charging cable to connect a 5V USB device without charging the lamp. During the charging process, the red indicator light turns on, and the lamp turns off after charging. 1* Bicycle wheel light 1* USB charging cable 1* Installation tool 3* Screw 2* Padding Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>