New KERUI 433M Frequency Outdoor Wireless Doorbell F52 Single Button Elderly Pager Smart Home Security Door Bell Welcome Chime Description: Scope of application Hotels, apartments, offices, families, meeting rooms, etc type Wireless doorbell button Applicable to any 433M frequency doorbell host of Kerui brand Specifications: The button is pasted outside the door, the host is inserted into the socket, press the button, and the host will ring immediately This product needs to be used with the doorbell host Elegant white, fashionable and beautiful Package Included: 1*Doorbell button