Remote Door Bells with Multiform Sounds and Frequency of 433

Widely used in hallways, gangways of enterprises, hotels, supermarkets and warehousesMultiform sounds for option: single dingdong, double dingdong, west minister and 12 melodiesSender: 12V DC (23A)Receiver: 3V DC (1.5V AA x 2)/4.5V DC (1.5V AA x 3)Frequency: 433.92MHzRemote control distance: ≤ 30mDiversified digital codesKeep far from high temperature, avoid sunlight, rain and wet places