Just what I needed
I use this device with my iPhone 5s with the sensor on my backpack. So far it works very well with useful software settings. Battery life on my phone appears unaffected and the battery in the device lasts 5-6 months and is easily and inexpensively replaced when necessary. Your iPhone monitors the device battery for you. If you travel or misplace items often, this device is small, easy to use and highly recommended!
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inSite - AudioVox Separation Alarm