M12 52 Musics Wireless Sensor Welcome Doorbell Shop Entry Detector Alarm with 2 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: •2 x Transmitter •1 x Receiver •1 x Installation Kit •1 x English User Manual