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 . All Funtion display ( Frequency counter ,Power watt , SWR ,FW,RW,Battery Level) Feature & Specification Frequency range: 125 - 525MHz Measurable power range: 0.5 - 120W(+-0.5%) Input read frequency counter (must be Less than 0.5 W) Maximum power: 120W Impedance: 50 Battery : 3.7V Li-ion Rechargeable Battery Interface: SO239 Feature & Specification (for version 2.02) MAX. Power in:120 W (Measurable power,Radio must be ANALOG) V.S.W.R: 1.00~19.99 Frequency :COVER : 125MHz~525MHz Insertion Loss: Less than 0.15dB(VHF) , Less than 0.25dB(UHF) Temperature:0~60 Frequency counter:Yes ( TX input must be minimum 0.5W + - 0.5%) Battery Display:Yes Auto Power Off:1-9 mins Charger in:5V (micro-usb) Backlight:AUTO OFF Interface (in and out ):SO239 Voltage: AC220V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Material: plastic colour: black Package Contents: 1 x Charging cable 1 x SWR Meter (Due to different product batches, the appearance may be different, which does not affect use.) 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.