Features: *It is more practical to use two 1W LED lights. *Large wide-angle design, the effective distance is as far as 1000 meters. *3 files flash mode. Rainproof design. * Lightweight, compact design. How to open the battery back cover: just open it by hand. *This product ships without batteries! Using 2 AAA batteries, the battery life is about 100 hours in flash mode. Specification: *Material：plastic *Size: 7CM*3.5CM*3CM *Color: Black+Red Package Contents： 1pc Bike Tail Light Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Our products are made from very durable, high-quality materials ,sure to meet the needs of your daily life. Before placing an order, we suggest that you always check the size and model of the product carefully to ensure that the selected product meets your actual needs. If you encounter any problems, please contact us in time, we will try our best to provide you with solutions until the problem is solved satisfactorily. After you receive the product, we attach great importance to your feedback, no matter how your comments, we will listen carefully. Every customer can enjoy the free after-sales service we provide, and any damaged or quality problem products can be refunded or exchanged.