Features: Small an compact, lightweight, convenient to wear on your arm. 120-125db loud alarm, it can be heard by people who are distant. It is suitable for girls, children, elderly and other protection needed people. Perfect for women and men to carry when they are goes out alone for exercise. Easy to use. Just press the button one time, it will alarm immediately. Specification: Condition: 100% Brand New Material: ABS Color: Black, White(Optional) Battery: 1 * CR2023 lithium battery Package Weight: Approx. 51g/1.8oz Package List: 1 * Alarm 1 * User Manual Note: 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. 1Small an compact, lightweight, convenient to wear on your arm. 2120-125db loud alarm, it can be heard by people who are distant. 3It is suitable for girls, children, elderly and other protection needed people. 4Perfect for women and men to carry when they are goes out alone for exercise. 5Easy to use. Just press the button one time, it will alarm immediately.