Feature: Made of high-elasticity waterproof silicone material, stable, durable, and strong extension tension. High-elastic silicone, multi fixing method-can be installed on the handlebar, seat post, front fork, backpack, etc. The light with white LED can be fixed in front of the helmet-night riding can be used as headlights and lights. The light with red LED can be fixed behind the helmet-it can be used as a tail light. 3 switching methods: fast flashing, slow flashing, and constant light. Can switch quickly according to your actual needs. Emergency lighting, outdoor play at night, mountaineering lighting, and bicycle lighting are all suitable. Can last for 35 hours at full brightness mode. Can last for 160 hours at flash mode. Effective visibility is higher than 600 meters. Quick disassembly design-installation or disassembly can be done without any tools. Specification: Appearance color: black body with white light, Product size: 40x30x30mm/1.57x1.18x1.18" Product net weight: 30g/pc Power supply: CR2032 button battery Packing List: 5 x Lights Note: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools. 2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.