This mobile phone is designed for military use,engineering ,outdoor activities like a cool, special mobile phone.It's the toughest phone in the world, With hardened rubber molding case via dual injection ,you can even drive a car over it .it passed the 2M drop test.the mobile phone is impervious to the wettest weather and water proof grade is IP54,it can work in extreme conditions(-20-+60c), On its backlit LCDscreen, the LM801 displays direction ,altitude ,barometric pressure andtemperature readouts. The compass, barometric pressure,and altitude functions of the pruductare assigned to a single button with easy switching .The highly sensitive altitude sensor responds even when you move the product up and down. The separate torch light and laser ponter buttons are standby at your fingertips whenever you need it. The phone is equipped witha 1300AH battery, the standby time is 450hours (lab test), further more with our specially designed manual charger, you can get power anywhere, any time !