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The Butterfleye may be small, but it will pack a rechargeable battery, microphone, and heat sensor.
Since it doesn't need to be plugged in to operate, you can place the Butterfleye pretty much anywhere you want.
Here's a look at the Butterfleye from the side.
On back is a Micro-USB port to charge up the Butterfleye's battery.
The bottom side of the Butterfleye houses a speaker for two-way communication.