Bushnell Wrist Top DNS Pro - The Bushnell DNS Pro is a smart, compact and durable wrist watch styled compass with many advanced features such as a barometer, altimeter, and weather forecaster. The advanced technology of the Bushnell DNS Watch (Digital Navigation System) allows quick, easy access to essential information in one compact package. Wherever you go, you can benefit from having the latest, most accurate information at your fingertips. Features alarm clock with snooze function, calendar, thermometer and compass with cardinal points. All units are protected by a rugged, rubber-armoured, 100% waterproof housing and feature a large, backlit LCD display. DNS Pro models also feature barometer, altimeter and weather forecasting functions. Features: Time & Date -24 hour or 12 hour. Alarms 3 for time. 1 for altitude-goes off when programmed level reached. 1 for temperature-goes off when programmed level is reached.Beep function - A beep sound is made when any button is pressed Stopwatch mode. Split timing function. Countdown timer. Digital compass: 1 degree resolution. Declination settings to adjust for local magnetic fields. Self-homing mode allowing you to preset a reference. Auto back light: LCD light comes on when activated. Night mode allows activation when any button pushed. Barometer mode: Measures pressure in hPa (mb). Barometric pressure graph showing readings for the past 13 hours.Weather forecast mode - Icons show: Sunny Partly cloudy Cloudy Rain/Snow. Temperature mode -measures temperature in °F Altimeter mode - Shown in feet or meters: Displayed in resolution of 5 meters. Measuring range between –700 to 8949 meters (-2300 to 29320 feet).Memory function - 10 memories available for storing information on altitude, time and date. Rubber armoured housing and waterproof. Battery Type- CR2430The DNS is designed for continuous use and batteries should last for over a year. Heavy use of alarms , light , or compass will shorten the battery life..