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The watches' fuel tanks are hidden under the motherboards and nestled within plastic midframes.
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The Watch4 Classic 46 mm accommodates a 1.40 Wh (361 mAh @ 3.88 V) battery—while its 40 mm little sister, the Watch4, houses a 0.95 Wh (247 mAh @ 3.88 V) battery.
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We shake the last components out of the midframe and find a familiar vibration motor next to the barometric sensor.
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But the most interesting part is the button flex cable. It not only carries a microphone (#snore-tracking), but is equipped with an additional contact plate opposite its connector. This allows the watch to close an electrical circuit through your body for bioelectric impedance analysis.
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