Get an instant alert when someone knocks on the door with this alerting device! Simply hang this door-hanging door knocker transmitter on a doorknob and it will detect vibrations from knocks on the door and send a wireless signal to your existing receiver system (not included).
This alerting system is safe, secure, and discreet? since you hang it on the doorknob/handle inside the room, there is no visible part outside the door. Ideal for ensuring privacy in hotel rooms or bedrooms.
IMPORTANT NOTE: This is a transmitter only; it requires you to have a receiver (not included). Compatible with Serene CA360 CentralAlert Wireless Notification System (item 931001) and Serene CentralAlert RX Vibrating Remote Receiver (item 931002).
This alerting system is safe, secure, and discreet? since you hang it on the doorknob/handle inside the room, there is no visible part outside the door. Ideal for ensuring privacy in hotel rooms or bedrooms.
IMPORTANT NOTE: This is a transmitter only; it requires you to have a receiver (not included). Compatible with Serene CA360 CentralAlert Wireless Notification System (item 931001) and Serene CentralAlert RX Vibrating Remote Receiver (item 931002).
