Fr510 Gps Altimeter Car Altitude Compass Fishing Barometer Temperature Gauge Waterproof Multi-function Hygrometer Time Date - Thermometer Hygrometer - AliExpress

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Specification:, Material: Plastic, Color: Black + yellow, Built-in battery: 300mAh, Item size: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8in, Item weight: 70g /

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GPS altimeter operation video