【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.