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High quality GPS chip inside.
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Use BLE wireless transmission protocol.
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Can connect with external heart rate mation, cadence sensor, power meter.
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Support altitude, slope, VAM, altitude drawing etc. climb data display.
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Compass, pressure, temperature display.
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Heart rate Zone, training target manage etc.
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History cycling data storage, can use computer USB send to Strava,Komoot etc sport Webs.