This digital compass is packed with features. Everything you need to keep your next outdoor excursion on track. Compass bearings, direction readings that are declination adjustable. Add altitude, barometric pressure, temperature and forecast icons to the mix, and you have an incredibly powerful navigation / weather tool in the palm of your hand. Rubber coated weather proof housing with lanyard for secure attachment. - Features: Altimeter: (Meters or Feet) Digital LCD Compass Declination Adjustable Relative or Absolute Height Selectable LED Backlight LCD Compass Barometric Pressure Weather Forecast icons base icon changing barometric pressure Time and Date Perpetual Calendar 256 Sets of Altitude & Barometric pressure data history Lanyard Included for easy and secure carrying Single 3V lithium battery (CR2032) ( included) Battery life: Minimum 12 months for base station - Specifications: Compass range: 0° to 359° (digital) 1 to 16 pointers (graphical) Temperature range: -20 ~ +60°C (-4°F to +140°F) Pressure resolution: 0.1h - Pa (0.1mm - Hg, 0.01in - Hg) Temperature resolution: 0.1°C/0.2°F Relative height accuracy : +/- 3m Absolute height accuracy: +/- 12m Anger accuracy: +/- 8°C Temperature accuracy: ±1.0°C