Loud 120dB alarm - emits a powerful sound to attract attention in emergencies. 40 lumens LED light - includes two modes, constant and flashing, for added visibility. Easy-to-use activation - pull the top pin to activate the alarm, reinsert to stop. Convenient carabiner clip. Rechargeable battery - lasts 1.5 hours with alarm and flashing light, 5 hours with flashing light only, 2 hours with constant light. Quick recharge - fully recharges in 1.5 hours with the included micro-USB cable. Size: 3.80 H X 1.14 W X 0.60 D