1. Lower power supply noise, the noise performance is more prominent when using harmonic technology, which can improve equipment performance and stability, and ensure clearer and more accurate signal output. 2. The built-in 400mAh battery can provide long-term stable power support, which is convenient for users to use when working in the laboratory or off-site, and can fully guarantee the running time of the equipment. 3. Add a MicroSD slot, which is convenient for users to save test data in SPI mode. It supports a maximum storage capacity of 32GB, and it is convenient and fast to store data. 4. Add RTC support, so that the device can obtain more accurate time information, which is very beneficial for users who need long-term data collection or precise control of time points. 5. Change the port names to Port1 and Port2, so that users can more clearly identify the purpose and distinction of different ports. In addition, this also helps users to experiment and test conveniently. PCB: 54mm x 85.5mm x 11mm (excluding connectors and switches) Measurement frequency: 50KHz ~ 1.5GHz RF output: -13dbm (Max -9dbm) Frequency accuracy: <2ppm Frequency stability: <0.5ppm Measuring range: 70dB(50kHz-300MHz),(50dB (300M-900MHz), 40dB (900M-1500MHz)); 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 400mAh battery, maximum charging current 1A, can be used continuously for more than 4 hours Number of calibration points: 101 (fixed) Number of scan points: 101 (fixed) Package includes: 1. Host*1 (including 2.8-inch touch screen, 400mAh battery) 2. 20cm SMA male to male RG174 RF cable *2 3. SMA female to female connector *1 4. SMA simple calibration set SHORT *1 5. SMA Simple Calibration Set OPEN *1 6. SMA simple calibration set LOAD *1 7. USB Type-C cable *1 8. Touch pen*1 9. Pick 10. Type-C to Type-C cable