<B>Features: </B><BR> - VSWR. Forward power direct digital readout, without any calibration. <BR> -Max. measurable power range up to 100W. - 3 seconds check your antenna SWR, also check your radio RF power watt.<BR> - Easy to install handheld Radio <BR><BR> <B>Specifications:</B><BR> - Measurable power range: 0.1-100W<BR> - Max. power: 100W Accuracy: mean + / - 5% <BR> * Not for the DMR digital radio.<BR> - MAX. Power in: 100W<BR> - V.S.W.R: 1.00~19.99<BR> - Frequency Range: COVER - 125MHz~525MHz<BR> - Insertion Loss: < 0.15dB(VHF) , < 0.25dB(UHF)<BR> - Temperature: 0℃~70℃<BR> - Battery Built-in: Li-ion Battery <BR> - Size:(WHIT OUT SMA): 25*25*60 (mm)<BR> - Power in: 5V (micro usb)<BR> - Interface (in and out ): SMA female<BR> - Impedance: 50Ω <BR> - Weight: 160g　<BR><BR> <B>Features function </B><BR> Push red button and hold 3 sec.to" Power on " and "SWR "mode "<BR> Push red button -" Power Meter "mode<BR> Push red button -" SWR "mode<BR> Push red button and HOLD -" POWER OFF<BR><BR> <B>How to use Power meter</B> <BR> Push red button -switch on<BR> Push red button at once to mode "POWER meter "<BR> Connect the SMA (mark TX) to Radio output .<BR> Connect the SMA to DUMMUY Load <BR><BR> <B>Caution:</B><BR> Please use correct dummy load, High power will damage the dummy load.<BR> <B>How to use SWR meter </B><BR> Push red button -" Power on " and "SWR "mode<BR> Connect the SMA (mark TX) to Radio output .<BR> Connect the SMA to ANTENNA <BR><BR> When the the led show 1.00 to 1.50 , mean the antenna is suit the frequency, <BR> When the the led show 1.50 to 3.00 ​ , mean the antenna is not good suit the frequency, <BR> When the the led show up to 5.0 to 19.99​ , mean the antenna is not suit the frequency.<BR><BR> <B>Package includes:</B><BR> 1 x Surecom SW-33 Mark II <BR> 1 x SMA Dummy Loads<BR> 1 x English Manual<BR> 1 x USB Charge Cable