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 Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!