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 Dbm5. Convenient, Fast And Easy To Use Unit: dBm[FUN]: Function button; [MODE]: Switch interface; [SEL]: Automatic addition and subtraction buttonDisplay measurement dataScreen display character interfaceFirst 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 valueScreen 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 the FUN key to save the preset dB value.SEL: Automatic addition or automatic subtraction buttonBy adding different RF attenuators and the user setting the relevant attenuation values, the RF power meter can read the correct power parameters.Colour:greenMaterial:PCBSize: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.