Handheld Spectrum Analyzer 2.8" Touch Screen Tiny Spectrum Analyzer        Note:with retailed package box,built-in 650mAh battery.        Specifications:    ABS case: 58.7mm x 91.3mm x 17.1mm (excluding protrusions)    ●Frequency accuracy: <2ppm    ●Frequency stability: <1ppm    ●Display: 2.8 inch TFT (320 x240) resistive touch screen    ●USB interface: USB type-C Communication mode: CDC (serial)    Power supply: USB 5V 150mA, built-in 650mAh battery, charging current 300mA, charging time 1 hour 2 hours        Low Input Mode Specifications:    Input frequency range: 100kHz～350MHz    Pre-fader: 0dB-31dB, 1dB step manual and automatic input attenuation    Input level: +10dBm without attenuation    Damage level: +20dBm        Third-order modulation (IIP3) input intercept point: +15dBm at 0dB attenuation    1dB compression point: +2dBm at 0dB attenuation    Power detector resolution: 0.5dB+/-1dB.    Recognized signal: -102dBm@30kHz RBW.    Phase noise is -90dB/Hz at 100kHz offset and -115dB/Hz at 1MHz offset.    No spur dynamic range when using a 30kHz resolution bandwidth of 70dB.    3, 10, 30, 100, 300, 600kHz resolution filters can be manually selected. One of 57 resolution filters is automatically selected.    The resolution on the screen is 51, 101, 145 or 290 measurement points.    Using the resolution filter, the scanning speed exceeds 1000 points/sec.    The actual scan point is automatically optimized to ensure that the entire scan range is covered, regardless of the selected resolution bandwidth.    Spur rejection option to evaluate whether certain signals are internally generated or actually present in the input signal.        High Input Mode Specifications: (High Input Mode is low IF reception with a second receiver without pre-image and spurious filters)        Input frequency range: 240MHz to 960MHz    Input impedance is frequency dependent and deviates from 50 ohms.    Since there is no input band filter, strong input signals outside the 240MHz to 960MHz range can cause in-band signal distortion.    Unattenuated input level +10dBm.    Input a third-order modulation product (IIP3) with an intercept point of -5dBm.    1dB compression point at -6dBm, no attenuation.    The power detector has a resolution of 0.5dB and a frequency linearity of +/-1dB.    The power level accuracy after power level calibration is +/- 1dB.    Using a resolution bandwidth of 30kHz - 115dBm discernible signal.    Frequency accuracy equal to selected resolution bandwidth    No spur dynamic range when using a 30kHz resolution bandwidth of 50dB.    3, 10, 30, 100, 300, 600kHz resolution filters can be manually selected. One of 57 resolution filters is automatically selected.    Optional 25dB to 40dB frequency dependent input attenuator. After activating this attenuator, the power level error increases to +/-10dB.    Screen resolutions of 51, 101, 145 or 290 measurement points.    Using the resolution filter, the scanning speed exceeds 1000 points/sec.