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.