Versatile Door ChimeThe M8 Wireless Door Sensor Chime is perfect for welcoming customers and notifying staff of arrivals and departures Customizable MelodiesChoose from 60 different music options to set the perfect tone for your business environment Adjustable VolumeFeatures 5 levels of volume control, allowing you to set the ideal sound level for your space Long-Range ConnectivityBoasts an impressive 300-meter straight-line range in open areas, ensuring reliable performance even in larger establishments Easy InstallationSplit 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 1 x Receiver 1 x Installation Kit 1 x English User Manual