1. This Is A Power Meter, Operated By Buttons. 2. Advantages: Simple Structure, Convenient Use, Stable Performance, High Reliability, High Sensitivity And Fast Measurement Speed. 3. Application: Power Measurement, Instrument Calibration; 4. Measurement Power Range 1MHz~10GHz -50~0dBm (External Rf Attenuator Can Be Extended To 100dbm); Measurement Power Resolution: 0.1 Dbm 5. Convenient, Fast And Easy To Use Unit: dBm [FUN]: Function button; [MODE]: Switch interface; [SEL]: Automatic addition and subtraction button Display measurement data Screen display character interface First line: "RF-POW -51.2 dBm" Second line:"610uV 7nW" Note: -51.2dBm is the dBm signal value; 610uV refers to the input voltage value; 7nW refers to the input power value. Adjust the RF power attenuation value Screen interface character display: Line 1: "RF Attenuator" The second line: "SUB 000dB" Button operation: [Entertainment]: Function button, select the add or subtract option. If SUB is displayed, it means subtraction; if add is displayed, it means add value. Long press the FUN key to save the preset dB value. SEL: Automatic addition or automatic subtraction button By adding different RF attenuators and the user setting the relevant attenuation values, the RF power meter can read the correct power parameters. Colour:green Material:PCB Size:about 55 x 45 x 10mm Package Contents: 1 x RF Power Meter Module 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.