| 摘要 |
A mobile phone case is provided to prevent the loss of a mobile phone in advance by adding an alarm function to an existing case to carry a mobile phone. A mobile phone case consists of a mobile phone receiving part(1) and a connection tool(2). An alarm device(3) is installed at the mobile phone housing part(1). The alarm device(3) consists of a main switch(31), a DC power supply unit, a contact switch(33), a timer, and an output unit. The DC power supply unit is connected to the main switch(31). The contact switch(33), connected to the DC power supply unit, is controlled by a contact of a mobile phone. The timer is connected with the contact switch(33). The output unit is connected to the timer. The connection tool(2) is provided to attach the mobile phone housing part(1) to a user's belt so that the user can conveniently to carry it.
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