Patent ID: 9466191
Filing Date: 2016-10-11
CPC Classification: G08B

Claim Text:
1. An alarm device for warning of an attempt to remove a portable electronic device, applied to a data port of the portable electronic device, the data port of the portable electronic device comprising: a power pin, a first data transfer pin, a second data transfer pin, a ground pin, and a conductive casing, wherein the ground pin and the conductive casing of the data port are electrically connected to a ground terminal of the portable electronic device; the alarm device comprising: a detection unit comprising: a power connection, a first data transfer connection, a second data transfer connection, and a ground connection, wherein the first data transfer connection is preset to a first electric potential; and a connecting unit comprising a connecting port and a contact switch, the connecting port comprising: a power pin, a first data transfer pin, a second data transfer pin, a ground pin, and a conductive casing, wherein the connecting port is configured to plug with the data port of the portable electronic device, electrically connecting respective pins and casings, the contact switch is electrically connected in series between the first data transfer connection of the detection unit and the casing of the connecting port; wherein the alarm device is set in detection mode when the connecting port is electrically connected to the data port of the portable electronic device, and the contact switch is attached to the portable electronic device to close the contact switch and thereby electrically connect the first data transfer connection of the detection unit to ground potential through interconnection of the connection unit and the data port; wherein the detection unit issues an alarm when electric potential of the first data transfer connection is detected to be switched from ground potential to the first electric potential due to interruption of the interconnection and/or a contact switch state change while in the detection mode.