VSWR. Direct indication of power forward and reflection, without any calibration. Maximum measurable power range up to 120 . Low insertion loss (0.3 decibels or less) structure allows it to be permanently connected. Visible operation: frequency, power, SWR, FW, RW Frequency testing range: 125-520 MHz Measurable power range: 1-120 W Test range vsw R: 1.00 - 19.9 Resistance: 50Ω Insertion loss: Less than 0.15 dB (VHF),Less than 0.25 dB (UHF) Temperature: 0 °C - 60 °C Auto power off: 1-9 minutes Interface: (input and output ) interface Battery: 3.7 in 600 mAh lithium-ion battery 5 V charger (micro-usb) Does not work with digital radio Color: As Shown Material: plastic Package Contents: 1 x SWR Meter 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.