The main function of the standard firmware is to measure antenna performance. Rugged and durable, effectively shields electromagnetic interference and ensures measurement accuracy. With an 2.8-inch LCD display, it is a DIY product that provides perfect vector network measurement functions. Small and portable, flexible and convenient operation. Easy to use, this project to provide a small but useful tool for RF enthusiasts. Measurement frequency: 50KHz ~ 300MHz (50KHz -900MHz, enable extended firmware) RF output: -13dbm (maximum -9dbm) Frequency accuracy: Less than 0.5ppm Measuring range: 70dB (50kHz-300 MHz), (50dB (300M-600MHz), 40dB (600M-900MHz) with extended firmware enabled); Port SWR: Less than 1.1 Display: 2.8 inch TFT (320 x240) USB interface: USB type-C Communication mode: CDC (serial) Power supply: USB 5V 120mA, built-in 400mAh battery, maximum charging current 0.8A Number of calibration points: 101 (fixed) Number of scan points: 101 (fixed) Show Tracking: 4, Markers: 4, Settings Saved: 5 Measure S-parameters, VSWR, phase, delay, chart...; Dimensions: 54mm x 85.5mm x 11mm (without connectors and switches) Colour:black Material:Metal Size:54mm x 85.5mm x 11mm Package Contents: 1 x host 1 x Type C data cable 1 x USB data cable 1 x stylus 2 x RF cable 4 x adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.