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Never miss another visitor or package delivery! Detects the vibration on door knocking. It can also connect to your existing doorbell, door chimes, or door intercom provided there is an external connection. Simple to install with adjustable sensitivity to avoid false alarms 2.5mm Jack for direct connection to your existing doorbell/door chime* *With this method, electrical signal from your doorbell or door chime activates CA-DX
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🇺🇸 Ship from USA · On Agora since 2025
$49.95