This new product is the only personal alarm that acts as an alarm for your laptop computer, window, and door. It also acts as a flashlight! There are two attachments, the first is a smart hook that is to be used on your belt or purse. Secondly, there is an attachment for a window, door, or laptop. Once the alarm is activated, a strobe light initiates to present attention. There is an independent button for the built in flashlight. This whole devices runs off of a single 9 volt battery (included).