3-in-1 Personal Alarm with Light - the only alarm that can act as a flashlight, 130 dB personal alarm, laptop computer alarm, and window or door alarm. 2 attachments allow it to be hooked on your belt loop or purse OR used on a window, door, drawer, or as a laptop alarm. Alarm activates a strobe light to attract attention or can be used as a flashlight. 9-volt battery not included.