M8 Commercial Wireless Door Magnet Sensor Chime Welcome Visitor Alert with 2 Transmitter + 2 Receiver - EU Plug/Black ?【Versatile Door Chime】The M8 Wireless Door Sensor Chime is perfect for welcoming customers and notifying staff of arrivals and departures ?【Customizable Melodies】Choose from 60 different music options to set the perfect tone for your business environment ?【Adjustable Volume】Features 5 levels of volume control,allowing you to set the ideal sound level for your space ?【Long-Range Connectivity】Boasts an impressive 300-meter straight-line range in open areas,ensuring reliable performance even in larger establishments ?【Easy Installation】Split sensor design with a compact door magnet and separate receiver for flexible and convenient setup Specifications: ?Product Model: M8 ?Music: 60 musics ?Volume: 5 levels ?Door magnet size:64mm*39mm*14.5mm ?Receiver size: 56mm*56mm*20mm ?Door magnet sensor battery: 12V 23A battery (included) ?Receiver: plug-in use (AC 100-240V) ?Remote control distance: 300 meters in a straight line on the ?open ground (data from the factory laboratory) ?Material: ABS Package included: ?2 x Transmitter ?2 x Receiver ?1 x Installation Kit ?1 x English User Manual