Specifications GPS Course Return: Direction, distance, speed GPS course return selection Altimeter: Altimeter range(-700 to 9000m/-2296 to 29500ft), with 1m/feet accuracy. Max./Min. memory for altitude. Altitude history and graphical display of the last 24 hour altitude readings. Altitude total gain or loss: 44999 meter/feet range. Sea level altitude setting. GPS distance, speed, erect ascending/descending rate, course return record. 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 Sea level air pressure setting. Compass: Direction Angle Thermometer: Range from -20 to 60 (-4 to 140) and selectable Max./Min. memory for temperature Hygrometer: Relative humidity(20% - 95%) Max./Min. memory for relative humidity Time: Hour, minute, second Year, month, day, date Alarm clock Time zone setting Specifications: Material: Plastic Dimension: 10 * 6.5 * 2cm / 3.9 * 2.6 * 0.8in Weight: 75g / 2.6oz Package Size: 15.8 * 11 * 3.5cm / 6.2 * 4.3 * 1.4in Package Weight: 126g / 4.4oz Features Adopt Swiss high-precision sensor chip Altitude gain/loss, 24-hour historical altitude data/curve record Historical altitude, air pressure, temperature, humidity records 24-hour historical air pressure graph Integrate functions such as altitude, air pressure, temperature, humidity, weather forecast, compass, flashlight, etc. Time, date, alarm clock function Built-in rechargeable lithium battery IPX4 waterproof Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if the products have some problems.Thanks for your understandings.