Yalumi Stellar White LED Safety Light/ 2 Lighting Modes: WhiteHigh Beam, and flashing Strobe High Brightness White LED - Battery Type (Included) 2 CR2032 Lithium Coin/ Water Resistant IPX4 Fits as Rear and/or Side Bicycle Safety Light in Dim Light or at Night Flexible Silicon Strap provides Multiple Uses including Strap on Clothing for Walker/Runners, Bags, Dog Collars etc. Maximum Burn Time: 30 hrs on Max Mode and 90 hrs on Strobe Mode.