Yalumi Stellar Red LED Safety Light/ 2 Lighting Modes: Red High Beam, and flashing Strobe High Brightness Red 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 Maximum Burn Time: 30 hrs on Max Mode and 90 hrs on Strobe Mode.