Wireless Door Magnet 60 ringtones/5 levels of volume /LED indicator. When , , and cabinets are opened, the receiver ring immediately. Receiver notifies when doors and are open. Whole House Security SystemKeep your children safe Alarm when child opens door. Ergency Alerts Preventing Break-ins. Free collocation and free combinationMeet different needs and multiple combination modes.Distinguish Between Front And Back DoorsAll receivers sound regardless of which door is open,but each door has a different tone so you know where your guests are.If you want the sensors and receivers to work one-to-one, try the steps in "How to clear the frequencies and repair".Suitable For More Scenarios: Window,Store,Hotel,Home,office,Pet doorConcern for the safety of childrenCaring for the Safety of the ElderlyCaring for the Safety of family membersProduct name:Door Sensor ChimeMusic: 60 musicProduct Model:Split Sensorvolume:5 levels of volumeDoor magnet size:64mm x 39mm x 14.5mmReceiver size: 56mm x 56mm x 20mmDoor magnet sensor: use 12V23A batteryReceiver: plug-in use (AC 100-240V)Remote control distance: 300 meters in a straight line on theopen ground (data from the factory laboratory)Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so onVoltage:AC220VColor: BlackMaterial: plasticPackage Contents:1 * Doorbell1 * ReceiverOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.