The Quark D2000 comes with an on-board accelerometer, temperature sensor, Arduino Uno-compatible shield interface, and yes that’s a CR32 coin cell slot as this dev kit is rated to operate at a mere 2.0-3.3V. However some users are upset with the kit, specifically the 32KB of instruction flash; that said, Mouser stock is currently at 0 for a few days now, so the board is clearly liked by some at only $15.
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