1. The compass has a triangle indicating the magnetic north pole. 2. The small side window and the red reference line help with reading azimuth data. 3. Positioning posts are placed at the 0 - degree and 180 - degree positions of the scale ring. The direction can be set by rotating the scale ring. 4. The compass is designed with balance. In non - horizontal states, it may not tilt and rub against the window frame, thus reducing the risk of the compass getting stuck. Its design makes it suitable for use in both the northern and southern hemispheres. 5. The precision of the inner teeth of the scale ring makes the calibration ring more accurate and helps reduce directional errors. It is waterproof up to 50 meters and suitable for deep - water operations. 6. The liquid - filled light - absorbing compass can absorb light sources like sunlight and lamp light and emit night - glow in the dark, enabling data acquisition. 7. It comes with an elastic cord that is tight, stretch - resistant, and adjustable. 8. Color: Black + Silver 9. Material: ABS + Glass 10. Dimensions: 8.2 x 6.2 x 3.5 cm 11. Package contents: - 1 diving compass - 1 elastic cord - 1 English instruction manual 12. The package mainly includes the above - mentioned items, and usually no other products are included. 13. Note: Light reflection and different monitors may cause slight differences between the color of the items in the picture and the actual product. A measurement error of +/- 1 - 3 cm is possible.