The image suppression of high inputs (240MHz to 960MHz) is very limited, and there is only one level of selectable built-in attenuator, which makes complex signals difficult to distinguish. The input attenuator is frequency dependent and varies between 25dB and 40dB. At lower resolution bandwidths (below 30kHz), the sweep speed will be slow. The performance limitations of the shielding and filters may cause some images and spurs to be visible. The provides a spurious elimination menu that experienced users can set to reduce spurs, but it is necessary to be aware of possible uncertainties. Below 0.1MHz, the sensitivity begins to decrease. Below 1MHz, it is recommended to disable the AGC and enable the LNA if possible to obtain the best measurement quality. When using the provided telescopic antenna or low , attention should be paid to the interference of the MCU on 48MHz and its harmonics. Not an SDR receiver, does not provide any receive demodulation function! Not a frequency sweeper, does not provide tracking source output, if you need frequency sweep function, please use ! Frequency accuracy: Less than 2ppm Frequency stability: Less than 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, maximum charging current 300mA, charging time 1 hour 2 hours Add port ESD protection to upgrade version(V0.3.1_E) Note There are significant limitations compared to professional spectrum analyzers. The internal phase noise sets a clear lower limit for phase noise measurements. The minimum resolution bandwidth of 3kHz makes it impossible to spectrum details. The product may be updated constantly, The Actual Product May Have Slight Differences Colour:Photo Color Material:Plastic Package Contents: 1x Spectrum Analyzers 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.