XOSS Vortex
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After the vortex is connected successfully, there are two models of speed and cadence on the details page of your vortex.
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You could click "speed" or "cadence", and the vortex will disconnect.
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You need to manually connect to the vortex again, and then you can switch successfully.
XOSS X1 Suite
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Twist the battery door with a coin in the OPEN direction, open the battery door, remove the battery, and load it again, after that, twist the battery door in the CLOSE direction, and close the battery door.
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After the battery loading, there will be a light on. The red light indicates speed mode, blue light indicates cadence mode.