GSM Door Alarm

About the product
>Simply insert a SIM card, install the Door Spy on a door (or window, if you prefer), and when the door is opened or closed, it will send you a text message!
>Powered by a high grade rechargeable lithium-ion battery, you'll get up to 150 hours (standby) of use per charge.
>You can even keep track of the battery power level; just send the device a quick text and it will reply with battery power level!
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