Helps deter danger and calls for attention in an emergency. 130 dB alarm can be heard up to 1,000 (300M) away. User-friendly " simply pull ring to activate alarm. Includes low battery test button. Versatile and customizable with adjustable wrist strap. Enhanced visibility thanks to reflective logo. Weather resistant high-quality, washable and polyamide lycra. Greater value " 4xLR44 batteries included.