It is useful, our product is different from others, small size and . Anyone could carry it around effortlessly, don't have to extract it from the inside of your bag, especially when in serious trouble time is everything. Unique design makes these Alarms fashionable and easy to grab, and its easy operating activator provides great convenience. There is key ring chain, could be used with house or car keys too. Alarm are small and portable, can be attached on keychain, backpack, ladies bag, belt loops, schoolbag, suitcase and so on.