【Versatile Door Chime】The M8 Wireless Sensor Door Chime provides a professional welcome and farewell solution for businesses, with 60 music options to choose from 【Adjustable Volume】Features 5 levels of volume adjustment, allowing you to set the perfect audio level for your environment 【Wide Detection Range】Infrared sensor detects movement from 2-7 meters away (depending on humidity) with a 110° left and right sensing angle for comprehensive coverage 【Long-Range Connectivity】Offers an impressive 300-meter straight-line remote control distance in open areas, ensuring reliable operation even in larger spaces 【Easy Setup】Receiver plugs directly into any standard AC 100-240V outlet for quick and simple installation Specifications: Product Model: M8 Music: 60 options Volume: 5 levels Sensor sensing distance: 2-7 meters (depending on humidity) Sensing angle: 110° left and right Sensor: powered by 3*AAA battery or power cord (not included) Receiver: plug-in use (AC 100-240V) Remote control distance: 300 meters in a straight line on open ground (data from the factory laboratory) Material: ABS