Features: The short waves power standing waves meter has a digital display that directly shows forward power, reflected power, antenna power, antenna efficiency, standing waves, battery voltages and accuracy. The swr power meter is designed special for car radio users or amateur radio enthusiasts with insufficient indoor space. The shortwaves power standing wavemeter has a power ranges of 0.5‑120w (up to 200w, FMmodes, am, CWmodes recommended for long term testing below120w, ssbmodes optional), onekeys display modes function, modes can be switched at will. If the battery is under voltages, the buzzer keeps prompting. When the standing waves is greater than 2.5, the buzzer will prompt intermittently.If the standing waves is greater than 3.0, the buzzer will keep prompting Specifications: Material:Metal Frequency ranges: 1.8mhz-50mhz Measurement ranges: 0.5w-120w (up to 210W, long-termFM, AM, CWmodes, recommended less than 120w, SSBmodes optional) Measurement accuracy: <±5% Standing waves ranges: 1-99.99 Package Includes: 1x Standing Waves Meter note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.