Safety light can be hooked on clothing or bag for outdoor sporting activity making you visible to oncoming traffic.7.5 ( l ) x 3.1 ( w ) x 2 ( h )ABS & PSmagnetic LED safety lightstrong magnet to clip item togethersilicone strap2 modes: static & flashing1st press: white static2nd press: red flashing3rd press: offLED lighttwo CR1220 batteries included