Tenq 1051 VHF UHF Digital SWR Meter for 2-way Radio Mobile Radio 120w Connect the Output of your transceiver to "TX" and Antenna or Load to "ANT". NOTE: UV-Band meter utilize "N" type connectors; and"SL16" connectors (normally named "M" connecter) for HF-Band. Proper adaptor/cable is required if your device has different type of connectors. Press the red button to power on. After 2 seconds of LCD self test, it''s ready for normal measurement. UV-Band meter will display in sequence:"+ XXX P" (pass through power),"- XXX P" (feed back power)," XXX " (SWR value), 2 seconds display for each mode. Press the red button will hold the current display. Press it again to continue the display. Under the environment of night or weak illumination, just press and hold the red button for 1 second to turn the blue back light on. Press and hold the red button for 1 second again to turn it off. 8 minutes after no power was measured, it will power off automatically. Press and hold the red button for 2 seconds to turn off manually.