This is a DIY product that provides perfect vector network measurement capabilities, tiny and handheld, stand-alone with 2.8-inch LCD display, portable with battery powered or USB powered The improved frequency algorithm can use the odd harmonic extension of si5351 to support the measurement frequency up to 900MHz. The 50535-300MHz frequency range of the si5351 direct output provides better than 70dB dynamic, The extended 300M-600MHz band provides better than 60dB of dynamics, and the 600M-900M band is better than 50dB of dynamics The default firmware main function is used for antenna performance measurement. The TX/RX method can measure the complete S11 and S21 parameters. If you need to obtain S12 and S22, you need to manually replace the transceiver port wiring The metal shield is designed to reduce the external interference and improve the measurement accuracy Package include NanoVNA host (with battery) x1, USB Type-C data cable x1, 30mm SMA male to male RG174 RF cable x2, SMA simple calibration kit x1, SMA female to female connector x1