** 3 Working modes: modes, normal- fast flash- slow flash. ** One touch switch: press to change the modes. ** Power: built-in 2*CR2032 button batteries. ** Waterproof: yes, but not for diving underwater. ** Universal for night riding, warning, emergency lighting, night outdoor play, mountaineering lighting, bicycle lighting, etc. Feature: **Made of high elasticity waterproof sili1cone material, silicone material is cold and heat resistant, regardless of low temperature minus 40 degrees or high temperature 220 degrees can be safely used. ** Stable, durable, strong tensile strength. ** Anti-water, anti-leaching, anti-rain. ** Installation or disassembly does not require any tools. ** Can be installed on the handlebar, seat cushion standpipe, front fork, rear fork, back backpack, helmet, etc. Steps for usage 1, first open the battery cover, remove the insulation sheet 2, re-cover the lid, press the switch in the middle of the top, the light is on, you can change the gear position by pressing

3, turn off the lights, fit in the right place