120-125db loud alarm, it can be heard by distant people. Small, compact, light, practical to carry on your arm. Easy to use. Just press the button once, it will ring immediately. Perfect for women and men to wear when going out alone for exercise. It is suitable for girls, children, the elderly and others in need of protection. Product description Specification: Condition: 100% brand new Material: ABS Battery: 1 * CR2023 lithium battery Package weight: approx. 51g / 1.8oz List of packages: 1 * alarm 1 * User Manual Reviews: 1. Please allow 0-1 inch error due to manual measurement, thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.