Connected doorbell and video doorbell - Universal - Wireless doorbell.(white) Highlights Universal Wireless doorbell.(white) Wireless home doorbell Features and specifications: 1.Press the button, Super Learning code can learn freely to match, can be unlimited matching receiver and button. 2.The screwless transmitter to achieve waterproof and dustproof. 3.The transmitter Use 23A12V alkaline battery (Battery not included). 4.The receiver uses 3 * AAA alkaline batteries, without the need to plug in the power supply and the battery can be used. (Not include battery). 5. Distance from reception: 300 meters in the open area. 6.The wireless signal will be affected by obstacles. The more obstacles, the more severe the signal loss. 7.Receur has 3 levels 20-80DB, 36 music to choose. 8.Transmitter Size: 80*44*22mm 9. Heart Size: 90*62*28mm 10.Just plug the receiver into a power outlet, the push button transmitter can stick it to the door with adhesive strips provided .