Safety Technology International, Inc. -STI - 12006 Mugger Stopper Plus Personal Protection Alarm – The Mugger Stopper Plus is a great personal protection unit for yourself and all your friends. Helps fend off muggers with its 9 volt battery operated alarm or calls attention to a fall or injury. When activated, unit emits an alarm and an attention-evoking strobe light which can be used as a flashlight only. Compact shock resistant and is lightweight enough to carry around in your pocket or clip to your belt. Also fits easily in your fanny pack or purse. Note: End user must verify the alarm and battery function every six months and replace battery annually or as required. Safety Technology International, Inc. "We protect the things that protect you"