Item Type: Altimeter Material: ABS Battery: 2 x 1.5V AAA battery, shipped without battery. Barometer Range: 350-1100hpa, resolution: 1hpa. Altimeter Range: -2296ft ~ 29500ft, resolution: 3ft. 1Better Guiding: Able to test atmospheric pressure and altitude, the altimeter will bring more convenience to your outdoor activities. 2Other Function: Can also display time, direction, position, temperature, weather forecast and more, the barometer will improve safety. 3Practical Uses: Enables wide application in hiking, camping, mountain climbing and so on, the multifunctional altimeter is a must have. 4Clear Viewing: Digital display together with backlight function ensures clear viewing even in the dim light, and very easy to operate. 5Easy Carrying: Lightweight and compact, the thermometer also has a hole on the upper left, so you can tie a lanyard and carry it easily.1 x Altimeter 1 x User Manual