Use the LCD screen to display the intensity of the satellite signal. Built-in signal alert buzzer. With LCD backlight/buzzer and attenuation control function. ATT increasing key. If the incoming signal is too strong, (the thermometer scale indicates max and the signal strength value indicates 99), it can easily be attenuated by activating this "attenuation" function, it reduces the incoming signal to a lower level. There are four mitigation stages totally. Specification: Type: Digital Satellite Detector Frequency range: 950-2150MHz Supply voltage: 13-18VDC Input level range: -40dBm - -10dBm Operating temperature: 0 - 40 Impedance: 75 Size: 13cm x 6.5cm x 2.7cm/5.12" x 2.56" x 1.06" (Approx.) Package includes: 1 x Digital Satellite Detector 1 x user manual (English language not guaranteed). Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.