LED SWR Meter 3-30MHz Frequency Shortwave Standing Waves Indicator for Television Broadcasting This product is a short band LED light indicating SWR meter. Powered by RF tapped power, no batteries are required, and easy to carry. SWR meter is a device used to measure radio frequency signals using 5 LEDs to indicate the strength of the signals, with different colors to indicate different ranges of SWR. It is used to measure and display the SWR of shortwave radio signals in the frequency ranges of 3-30MHz. Input power does not exceed 100W, the smallest LED (>1.0 corresponds to the green light) light requires 5W power, suitable for a variety of shortwave radio equipment. Specifications: Name: SWR Meter Material: metal Using frequency: 3-30MHMz Maximum power: no more than 100W Insertion Loss: <0.3dB VSW: <1.2 Interface: M female Item size: 25 * 25 * 90mm / 0.98 * 0.98 * 3.54in (not counting M base) Package size: 80 * 30 * 50mm / 3.15 * 1.18 * 1.97in Package weight: 85g / 3.00ounce