B015D54IC2 Height Altitude and G Force Speed XYZ Direction Sensor Pack for GoPro 3 3+ 4 Black Silver Camera

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Subtitled video playback for your GoPro camera
Altitude subtitles selectable as feet or meters
Acceleration G-force subtitles selectable as X-Y-Z axes or total magnitude
Fits in GoPro cases with BacPac backdoor (not included)