Made of fine quality material, practical, easy to operate and use, wide application range, has a long service life. Adopt stm32f407 single-chip microcomputer (main frequency 168M) and 4.3-inch TFTLCD (480x800) color LCD screen. Full aluminum alloy housing and rotary encoder control. Built-in lithium battery, full English display. Spectrum display range is 35M-4400MHz. Scope of use: walkie-talkie, plaything remote control, 2.4Gwifi. dBm range:-80dB-10dB (support manual adjustment of calibration amplitude), the unit does not have an amplifier circuit inside, if you need to measure small signals, you need an external amplifier. Battery:1 x lithium battery, 2000mAh (included) Spectrum display range:35M-4400MHz Input impedance:50 ohms RBW:100KHz, 200KHz, 500KHz, a total of 5 gear positions can be adjusted Screen scan points:700 points Scanning span:7M (10KHz), 35M (50KHz), 70M (100KHz), 140M (200KHz), 350M (500KHz) Maximum access signal:10dB Working mode:superheterodyne scanning spectrum analyzer, single scan time is 800ms Note: This product uses the local oscillator signal and the external test signal to obtain the difference frequency signal, and calculates the amplitude of the external test signal through the detector. Using a high accuracy VCO source, the heterodyne signal frequency can be measured very accurately. Since the scanning range is very large (35M-4400M), because there is no special detection circuit for the external measurement signal due to cost and other factors, the measurement amplitude may have errors. Therefore, the product increases the magnification and displacement parameters, and the user can adjust the display waveform by himself. The amplitude display is adjusted and calibrated. Colour:Black Material:Aluminum alloy Size:145x70x30mm/5.7x2.8x1.2in,Screen size:4.3 inch Package Contents: 1 x spectrum analyzer 1 x glue stick antenna 1 x telescopic antenna 1 x TYPE-C charging data cable 1 x machine corner pad 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.