Basic performance of 2.8 inch version:● PCB: 54mm x 85.5mm (excluding connectors and switches)● ABS shell: 58.7mm x 91.3mm x 17.1mm (excluding protruding parts)● Measuring frequency: 10KHz ~ 1.5GHz● RF output: 0dbm (±2dB, fundamental wave)● Frequency accuracy: <2ppm● Frequency stability: <0.5ppm● Measurement range: 70dB (50kHz-300 MHz), (60dB (300M-900MHz), 40dB (0.9G-1.5GHz) enable extended firmware);● Port SWR: <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 650mAh battery, maximum charging current 300mA● Number of calibration points: 101 (fixed)● Number of scanning points: 101 (fixed)● Display tracking: 4, mark: 4, setting save: 5 (Chinese version 4)