Additional doorbell transmitter for the HA360MK (sold separately which already comes packaged with one doorbell transmitter) to alert you when someone is at a second door (back door; side door)
A total of four (4) doorbell transmitters may work with the HA360MK to accomodate other doors
Doorbell transmitter may be used as a portable SOS alert
Can be installed in minutes and requires no wires
Can also use doorbell transmitter as a portable personal SOS alert

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Sonic Alert HomeAware Replacement Doorbell

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