Radioddity Surecom SW-102 Professional UV Dual Band LCD Digital SWR & Power Meter, 125-525Mhz VHF/UHF Antenna Power Meter for Two-Way Radio Walkier Talkie Transceiver, Black VSWR. Forward and reflected power direct digital readout, without any calibration. Maximum measurable power range up to 120W. Low insertion loss (0.3 decibels or less) structure allows it to be permanently connected. Build in Frequency counter . Connect the Output of your transceiver to "TX" and Antenna or Load to "ANT". Proper adaptor/cable is required if your device has different type of connectors.1) Adj. RF Forward %.Press 2 second the [Red button] to power on or power off All Funtion display ( Frequency,Power , SWR,FW,RW,Battery voltage)