VSWR Value: When VSWR is less than 1.5, the green light is on. When VSWR is greater than 1.5 and less than 2.5, the yellow light lights up. When VSWR is greater than 2.5, the red light is on. When VSWR is greater than 2.5 and less than 3, the buzzer will intermittently alarm. When VSWR is greater than 3, the alarm is continuously alarmed. If the battery voltage is low, the buzzer will keep prompting. Charging Display: SWR power meter built in 1000 mAh battery battery, no external power supply, there is a buzzer alarm function when the battery is undervoltage. Moreover, the instrument is turned on, a red light is displayed when charging, a green light is displayed when it is full, a yellow light is on when the battery is undervoltage, the buzzer is constantly prompted, and the buzzer can be turned off with one button. Aluminum Alloy, Portable Size: Standing wave ratio meter cover plate is made of aluminum, aluminum alloy shell wear resistant and resistant, not easy to rust, long service life. The tool is small in size and very convenient for daily use, and it is convenient to carry it around. Digital Display: SWR power meter has Organic Light Emitting Diode color screen digital display, which can directly display forward power, reflected power, antenna power, antenna efficiency, standing wave, battery voltage and accuracy. At the same time, the standing wave meter has compact structure, easy to carry, small size and light weight. Designed for car radio users or radio amateurs with insufficient indoor space. Power Range: The power range of SWR power meter is 0.5‑120W (up to 200W, FM, AM, CW mode is recommended for long term testing below 120W, SSB mode is optional), one key display mode function, the mode can be switched at will. At the same time, the control layout of the short wave power standing wave meter is convenient and easy to operate.