SABRE Runner Personal Alarm - 130dB (1,000 Feet/300M Range) with Adjustable/Reflective/Weather-Resistant Wrist Strap for Walking & Running Outdoors LOUDEST/GREATEST RANGE - piercing, 130dB alarm calls for attention up to 1,000 feet/300M away and helps scare off attacker; fully reusable ADJUSTABLE & ONE SIZE FITS ALL - length ranges from 5.5" - 8" and this sweat- and weather-resistant alarm is comfortable with no itchy nylon strap and an easy-to-use velcro closure MAXIMIZED SAFETY/BE SEEN AT NIGHT - reflective material helps cars and witnesses locate you in the dark GREATER VALUE - replaceable A23 12V battery with low battery test button included to ensure your device is working when you need it most USER-FRIENDLY WITH BROAD APPEAL - simply pull the metal ring to operate (easy to operate under stress!); a self-defense option for any age