Connected doorbell and video door phone - Universal - The wireless receiver does not need a battery.(Colored) Highlights Universal The wireless receiver does not need a battery.(Colored) The wireless home receiver of the doorbell does not require batteries Features and specifications: 1.The button supports up to 2 pcs and the receiver supports up to 100 pcs. 2.If multiple buttons are paired with one or more receivers in the same system, each button can be set to a different ringtone. 3. Off-on memory function: return again after power off, no need to redefine and lock the ringtone. 4.The transmitter has no screw chuck design, and it can be waterproof and dustproof without rubber ring. 5.The transmitter Use 23A12V alkaline battery (battery not included). 6. Core voltage: 110-220V. 7.The receiver comes in a variety of plugs, US/EU/UR/AU adapters, suitable for most countries. 8. Shorten the distance: 300 meters in the open area. 9.The wireless signal will be affected by obstacles. The greater the obstacles, the more severe the signal loss. 10.Receur has 4 levels 20-80DB, 36 music to choose. 11.Size: 77x46x20mm transmitter, 90x56x20mm receiver. Note: The button cannot be placed on an iron door as it will interfere with the signal. Only sell the doorbell in the picture, the rest of the goods are only for sale, not for sale