Features: Adopt super-accuracy sensor from Swiss. Altitude total gain or loss, 24 hours altitude record and chart. Max or min altitude, temperature, huminity record. 24 hours air pressure trend chart. Incorporates altimeter, barometer, compass functions, etc. Thermometer, hygrometer, time, date, alarm clock, LED torch. Built-in rechargable battery. LCD backlit. IPX 4 waterproof. Note: Please do NOT submerge in water. Specifications: Altimeter: Altimeter range(-700 to 9000m or -2296 to 29500ft) Resolution of 1 meter or feet Max. or Min. memory for altitude Altitude history and graphical display of the last 24 hour altitude readings Altitude total gain or loss 44999 meter or feet Barometer: Pressure range 300hpa to 1100hpa(8.84inHg to 32.44inHg) Resolution of 0.1hpa(0.01inHg) 24 hour pressure history and graphical display Electronic pressure weather forecast(sunny, slightly cloudy, cloudy, rainy) Pressure trend indicators Thermometer: Range from -20 to 60 (-4 to 140) and selectable Max. or Min. memory for temperature Hygrometer: Relative humidity(20 percent - 95 percent ) Max. or Min. memory for relative humidity Package: Material: Plastic Color: Black and yellow Built-in battery: 300mAh Item size: 10 6.5 2cm or 3.9 2.6 0.8in Item weight: 70g or 2.5oz Package size: 16 11 3.5cm or 6.3 4.3 1.4in Package weight: 128g or 4.5oz Package List: 1 Altimeter 1 Charging Cable 1 Lanyard 1 Cleaning cloth 1 User Manual (English)