Product name:Bicycle taillights Product size about : 4*4*2cm/1.5*1.5*0.7in Charging method: type-c Weight: 30.5g Battery capacity: 300mAh Charging time: 2 hours Battery life: 13-10 hours Product color: As shown in the figure Product material:ABS product features: 1. Smart induction brake: Unique smart induction brake technology, the brightness will suddenly increase when you brake, which can better alert the rear vehicle, prevent rear-end collision, and make you safer and worry-free. 2. Four lighting modes: There are 4 modes to choose from, including slow flash, fast flash, constant light, slow, etc., giving you more choices and more personalized usage. 3. Automatic sleep and power saving: The bicycle taillight can be used for about 10-12 hours after charging. After riding is prohibited for 30 seconds, it will automatically sleep and save power, so you dont need to turn it off manually, and save power easily. 4. Easy to install: We have two installation methods, seat tube installation and under the seat cushion installation, and provide a mounting bracket for your installation and use. Details determine success. This product is easy to install, allowing you to enjoy convenience and ease. 5. Gift: This is a cycling gift worth buying and adding. It brings safety and increases the other persons emotions. You can give it to a friend who loves cycling, and he will be moved by the taste of this smart technology. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc Bicycle taillights