???100% brand new. Made from superior material, has high durability. Scientific instrument, accurate test and intelligent operation. 2.8in large TFT digital display shows the data and image clearly. Supports screen touching, convenient to operate. Each fitting has independent packing and all of these fittings with independent packing are packed in another metal-shielded bag in package box. ???You can export Touchstone (snp) files for various radio design and simulation software through PC software. Metal shields have been developed to reduce external interference and improve measurement accuracy. The enhanced frequency algorithm can use the si5351 odd harmonic extension to support the measurement frequency up to 900 MHz and provide perfect vector network measurement. ???The frequency range of the si5351 with direct output of 50k-300MHz offers a dynamic of over 70dB. The extended 300-600 MHz band provides over 50 dB of dynamic, the 600-900 MHz band. Better than 40 dB of dynamic. Supports TX/RX measurement, can determine the complete S11 and S21 parameters. You can get S12 and S22 parameters after manually replace the transceiver port wiring. ???The system Led light and darkness changes when the system is properly scanned. You can move the mark Point or perform a menu operation via the multifunctional switch, or use the touchscreen operation directly. Built-in rechargeable 400mAh lithium b-attery, environment-friendly, economical and practical. You can use the USB cable connect to computer or connect to charger. ???Led indicator can show the status of b-attery. When Charging, the led would flash; when Charging full, the led keeps constant light. When discharge the b-attery, the constant Led light indicates normal discharge and flickering Led light indicates Low Power. Small and lightweight, convenient for you to carry anywhere. Easy to use. Just need some patience, but not ask for you be an expert. Provides an RF gadget but useful instrument for enthusiast.