1TOUCH SCREEN: Equipped with a 4in 480 x 320 sensitive touch screen, this vector network analyzer can accurately measure the S11 reflection coefficient and S21 transmission coefficient of high frequency networks. 2WIDE APPLICATION: Suitable for radio amateurs to check and adjust antennas, measure coaxial feeders, line analysis and scanning, shorten the coefficient, phase, and magnification of antenna amplifiers, etc. 3FREQUENCY RANGE: The analyzer features an ultra wide measurement frequency range of 50KHz-4GHz, with improved accuracy, up to 90dB dynamic range (to 1GHz) and up to 80dB dynamic range (to 3GHz). 4HIGH PERFORMANCE: This vector network analyzer has fast scanning speed, high strength, good stability, high sensitivity and accuracy, supports PC control, and is compatible for Linux, for Windows (7+), for OS X (10.11+). 5WITH BATTERY: With a clear screen and perfect size, built in rechargeable battery, has long battery life, and battery LED indicator on the back, the closest to the CH1 port connector is the lowest battery, indicating 25%.