The device uses one CR1632 battery.
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Remove the device from the band.
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Use a small Phillips screwdriver to remove the four screws on the back of the device.
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Remove the rear case and battery.
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Insert the new battery with the negative side facing the inside of the front cover.
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Verify the gasket is not damaged and that it is fully seated in the rear case.
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Replace the rear case and the four screws.
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Tighten the four screws equally and firmly.
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Insert the device into the flexible silicone band by stretching the band material around the device.
The arrow on the device must be aligned with the arrow inside the band.