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Infrared Sensor Motion Detector Wireless Doorbell Access Control Alarm System Smart Prompt Door Bell Home Security Protection Specifications 1、 Working Voltage of the Receiver：110V-240V 2、 Working Voltage of the PIR Sensor：4.5V（3  AAAbatteries） 3、 Receiver Switch Setting ：  1）Music source: 38 different songs for optional Use the external button "music" to finish 2） The function of volume adjustment: there are three kinds of volume (high, middle, low) for choice 3） Adjust sound and silence 4、 Working Range: Up to 70 meters 5、 Infrared sensing distance: 3-7 meters 6、 Receiver size：76*80*33mm 7、 PIR Sensor size：80*59*45mm 8、 Packing size：17.5*11*7.5cm 9、 Weight：0.22kg Box Contents: 1 x Receiver 1 x PIR Sensor 1 x Instruction Manual Care & maintenance portion 1, Important: please keep the detector & receiver in sheltered places to avoid contact of both units form water and direct sunlight. 2, When the LED indicator does not go on , the battery power is either low or dead. At that time you should change the batteries. 3, Clean the detective regularly with a damp cloth to avoid blockage of sensor by dirt or any small particles. 4, Try to keep it in areas where it will not get wet. In addition, during heavy storms & snowfalls, it is recommended that unit should be moved indoor or in a safe place. 5, Never attempt take apart the units. 6, When the unit is not in use, take out all batteries; clean both units and store the units in dry , cool place. 7, The device is not a toy and should keep out of reach from children.