Device Size and Weight
Size: 4.31" x 2.32" x 0.47"
Weight: 3.99 oz

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Comparison of AngelSense devices
From the AngelSense Blog:
Why Your Child with Autism Needs a BIGGER GPS Device
Proactive alerts to routine deviations and providing consistent location updates in poor GPS and cellular conditions are indispensable features. Supporting these capabilities require enough power to sustain the device and can only be achieved with larger battery size and an equally accommodating device.