This is a DIY product that provides perfect vector network measurement capabilities in the size of a credit card. It includes a 2.8-inch touch screen and 400mAh battery, which can be used offline for 2 hours. The metal shield is designed to reduce the external interference and improve the measurement accuracy. Simple and practical PC control software, you can export Touchstone (snp) files for various radio design and simulation software through PC software. The improved frequency algorithm can use the odd harmonic extension of si5351 to support the measurement frequency up to 900MHz Power: USB 5V 120mA, built-in 400mAh battery, maximum charging current 0.8A Measuring S parameters, voltage standing wave ratio, phase, delay, Smith chart..