In addition, the digital thermostat at Shirley's home had been replaced by a slide-switch thermostat that "will produce a spark when the thermostat reaches a specified temperature, " the probable cause affidavit says.

CNN: 3 charged in deadly Indianapolis home explosion

Rather than using a passcode or swipe pattern to unlock the phone's screen, the new handset's fingerprint sensor allows users to simply press and slide a finger across a switch to quickly unlock it.

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Along the top edge, you'll find the e-ink display and a two-way power switch -- slide it to the left and Ruby behaves like a secure hotspot, slide it to the right and it's a public access point.

ENGADGET: Topic: Mobile