Doberman Security SE-0106-3PK Ultra-Slim Window Alarm, 3 Pack (Sliver) SOLD BY AND SHIPS FROM AMAZON.COM is the only Authorized seller of Doberman Products. Other sellers ship fake product and no warranty or service will be provided. Built-in sensitive vibration sensor. Alarm triggered after window vibration by an intruder. The perfect device to detect intruder break-in via the window of your house, apartment, store, office, R.V. or dorm room. Loud 100 dB alarm. Warning sticker to deter theft