AGPtEK Water-proof Red USB 8 LEDs Cycling Diamond Appearance Design Laser Taillights Bike Rear Security Light, Powered by Rechargeable 1200 mAh Battery Rechargeable battery, high content L1 Battery make it long use time and environmental protection, even decrease more cost. After recharged, it can be used 6 hours continuously.It is water-proof, improve the safety of ridding in rainy days (can&#39;t for diving use).Laser design, en