High quality and durable and reusable. Waterproof and can work under the water. This device has six functions: compass, altimeter, barometer, thermometer, weather forecast and time display. Time with hour, minute, second, 24 hours format clock display. Compress: 4-bearing mode display and magnetic declination setting. Next 12 to 24 hours weather forecast. Barometer range from 300mbar to 1100mbar. All functions are displayed on LCD screen with super bright LED backlight. Easy to use and easy to carry with a lanyard included. Uses CR2032 lithium battery. Ideal for outdoor activities.