Fully sealed design, suitable for harsh environment such as field; Low power consumption, long battery life; Optional magnesium alloy shell, small size, light weight; Bright LCD screen, visible in sunlight, high resolution; Keyboard, trackball and touch screen design, easy and reliable operation; Prevent information leakage, low electromagnetic radiation; Compact structure and sealed door design, strong adaptability to the environment, suitable for field work; Wide temperature design, can be directly started at low temperatures