The LCD screen displays both the absolute and relative value measured digitally at dB, dBm, uW, and nW. The numbers are large and easy to read, and the LCD screen has a backlight function, so you can check the numbers clearly even in dark places. When you turn the switch on, it will start in 1 second, and it will automatically turn off after 10 minutes of use to reduce battery consumption. 3 AA batteries can be used for about 120 hours, making it economical and cost-effective. It is convenient to carry with one hand.