M12 52 Musics Wireless Sensor Welcome Doorbell Shop Entry Detector Alarm with 3 Transmitter + 1 Receiver - EU Plug/White ???Long-Range Reception??Achieves a direct line reception distance of up to 280m in open areas,ensuring reliable connectivity across large spaces ???Adjustable Sensing Range??Features a customizable sensing distance of 2-7m,adaptable to various temperature conditions for optimal performance ???Wide Detection Angle??Offers a 110?? left-right sensing angle,providing comprehensive coverage for entrances and doorways ???Customizable Alert System??Includes 52 selectable melodies,including 8 welcome messages,9 prompts,33 classic ringtones,and 2 emergency alerts ???Adjustable Volume Control??Features five volume levels,including a silent mode with only light indication,catering to different environmental needs ???Easy Setup??Receiver unit operates on standard 110/220V power,allowing for simple plug-and-play installation ?Specifications: ?Product model: M12 ?Material: ABS ?Receiving distance: 280m straight line on open ground ?Sensing distance: 2~7m (depending on temperature) ?Sensing angle: 110?? left and right ?Sensor power supply: battery power or power cord power (not included) ?Receiver power supply: plug in (110/220V) ?Volume level: five levels (adjustable only flashing light) ?Music selection: 52 music (8 welcome words,9 prompt words,33 classic ringtones,2 emergency prompts) ?Note: The above parameters are provided by factory laboratory tests. Package included: ?3 x Transmitter ?1 x Receiver ?1 x Installation Kit ?1 x English User Manual