The emergency alarm can make a loud sound to draw attention to protect you from having an emergency even at distances as far as 606.9 ft. In addition, the sounds could last 50 minutes continuous ear-piercing alarm. This Personal Alarm equips with 3 AG13/LR44 batteries for extended life They'll last up to 365 days before you need to consider replacing them. With LED lights, the emergency alarms can be applied for night lighting, suitable for people at all ages such as students, elderly, children, women, night workers and so on; You can also use them for traveling, hiking, camping and dog walking at night. A Safety Protector For Your Family Members,SOS device for the old. You can keep this personal body alarm on hand to use when you need urgent help. Female anti wolf alarm Invest in a personal alarm that can help you attract attention and deter attackers in dangerous situations. Easy to use the alarm will be activated when you pulled the contact pin out. To silence, just inset the contact pin in, the alarm will be off. Battery type: LR44(3 pieces per alarm) Battery working time: 1.5hour(continuously making alarm sound) LED emergency light: 24-hour lighting Material: ABS Size about: 70*46*22mm Package Contents: 1* Vocal alarm Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.