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SpecificationsVOL: 120dbDimension: 2.68*1.5*0.98inchBattery: 110mA,12VColor: BlackQuantity:3pcs Product Description:Whenever and wherever we much take care of ourselves,but We never noticed so,the accident happened.This personal alarm can reduce unnecessary accidents. About Product:When the alarm sound goes low, please remove screws from back cover and replace new batteries.Pull off the hand strap to activate alarm. (To turn off the alarm, insert the hand strap to the plug.)The alarm sound is very loud, please do not put by your ears.