Protect yourself and your family with this vanguard personal alarmr emits 120 125 db of sound and powerful flashes of led lightr activate it by pulling out the key ring from the small devicer an easy way to disable muggers and stalkers when you feel threatenedr high quality and durable newtonstein productr compact keychain design to carry with you at all timesr works with 3 ag13 batteries and will ring for more than 1 hourr measures 8cm l x 5cm w x 28cm d and w