Loud 110dB-enough to scare the intruder or notify neighbors.Prevent Robbery. CHIME MODE - is ideal to prompt you when child, guests or dementia patients are opening the door. ALARM ACTIVATED - when the parts are separated, recombined stops. EASILY INSTALLATED - in pool doors/refrigerator/drawer/freezers/interior door for kids safety. battery can last longer. RELIABLE AND GREAT VALUE - 3xLR44 batteries included, also Low battery indicator.Value for money home security products. If you have any questions, please feel free to contact us. We are always here. The magnetic sensor system will be triggered immediately once you separate two parts. It's cost-effective security solution to ensure that the property and personal safety, to prevent illegal molecular burglary, theft, robbery and other criminal behavior. Alarm Volume:110dB Function Anti-Theft; Color: White Material; ABS Plastic Battery life; ;over 12 months Including items ;1*alarm host, 1*magnetic sensor Weight; 35.4g Alarm type; Wireless Detector mode; Magnetic door sensor Host battery 3*1.5V AG13 or LR44(included) low battery test button. Size ; 9*35*13mm(magnetic sensor); 56mm*30mm*18mm (host) Working temp -10℃~60℃ Working humidity ; 80% operating current ≤80mA Storage temp; -20℃~70℃ Even if door and door frame are not on the same flat surface, door alarm works properly.