Main Features 1 Forward Reversed VSWR ration in one push button 2 LED backlight display for easy reading 3 Powered by AAA batteries external USB port 4 Applicable rechargeable battery 5 Micro USB DC 5V output not include adapter 6 Convenient control layout for ease operation Specifications Frequency range 125 525 MhzCenter calibrated 145Mhz VHF 435Mhz UHF Power range 0 120W 5 Testing functions Fwd Rev Power SWRInsertion loss 0 3dB or lowerImpedance 50 ohmPower source battery AAA or Micro USB portConnector M type or N typeDimension 70W x 78H x 30D mmNet Weight 220g no batteries Measurement 1 Apply output of transceiver to TX and antenna or load to ANT 2 POWER on for ready to use 3 LCD display show simultaneously Fwd Rev Power and SWR 4 For back light please switch LIGHT to ON No function in 30 seconds the backlight will automatically off Once PTT launched the backlight will be back Battery installation 1 Remove the black screw from the cover to open the rear panel 2 Install 2 pcs AAA batteries 3 Can be used with alkaline or Ni Ca Ni MH rechargeable battery 4 This unit has no built in charging circuitry 5 Be sure to correct polarity of battery 6 Remove the battery if the unit wont be used in long period Pacakage Includes 1NISSEI RS 50 SWRPower Meter Battery is not included Detail Pictures