Key Features:�� Adopt advanced infrared detect technology.�� 200m control distance， you can mount the detector properly by the front door， window frame， driveway， walk path， backyard or anywhere you need.�� Easy to install and no electrical wires to install.�� Unique appearance design， evoking an aesthetic feeling.�� The chime unit is powered by 2 x AA battery ( not included ) and the PIR unit is contains built-in batteries.�� Perfect for home， office， hotels， jewelry store etc.�� PIR devices / Chime unit size: 6.5 x 3 x 9cm / 6 x 4.7 x 9cm ( L x W x H )Care Maintenance Portion:�� Important: Please keep the detector receiver in sheltered places to avoid contact of both units from water and direct sunlight.�� The LED indicator does not go on if the battery power is low or dead， at that time you should change the batteries.�� Clean the detective regularly with a damp cloth to avoid blockage of sensor by dirty small particles.�� Try to keep it in areas where it will not get wet. In addition，during heavy storms or snowfalls， it is recommended that the unit should be moved indoor or in a safe place .�� Never attempt to take apart the units.�� When the unit is not in use ，take out all batteries，clean both units and store the units in dry，cool place �� This device is not a toy and should keep out of reach from kids Package weight: 0.2241 kg Package Size ( L x W x H ): 11 x 10 x 8 cm / 4.32 x 3.93 x 3.14 inches Package Contents: 1 x PIR Infrared Sensors Wireless Doorbell， 1 x Transmitter， 2 x Installation Kit， 1 x English Manual