Shop Nilight LED Safety Light 4PCS Red Marine Navigation Bike Tail Lights Three Modes Waterproof Reflective Gear Clip On Flash Strobe Indicator Lamp for Night Boating Fishing Cycling Jogging in high quality,support 2-year warranty.Each light is equipped with 2pcs CR2032 batteries, which are durable and have a long service life. To replace the battery, use the included screwdriver to remove the back cover, replace the battery with a new one, and then reinstall the back cover