13 Inches LARGE LCD DISPLAY : The Wall Hanging Sound Gauge features a 13-inch LED screen with adjustable brightness, offering clear visibility even in low-light conditions. This allows easy monitoring of sound levels, temperature, and humidity ALARM FUNCTION And COLOR-CODED INDICATORS : Sound Level Meter Built-in alarm system can be activated to alert you when sound levels exceed safe limits. Adjustable between 30~130dB or turned off completely, The decibel monitoring device uses color-coded indicators to signal safe (green), moderate (yellow), and dangerous (red) sound levels, offering visual alerts to protect the user's hearing in real-time MULTIFUNCTIONAL MONITORING : Sound Decibel Meter In addition to measuring sound levels, the wall-hanging sound gauge also tracks ambient temperature and humidity, providing users with a comprehensive overview of environmental conditions, support convenient desktop and wall hanging, widely use for classroom, studio, office, home, library, etc HIGH-PRECISION SENSOR : The Noise Level Detector features a high-precision sensor for accurate sound level readings between 30-130dB, ensuring reliable performance in all environments USER-FRIENDLY DESIGN : The Sound Decibel Meter has been designed for user convenience with features such as selectable temperature units (C/F), 12/24-hour time display options, FAST/SLOW response settings for versatile usage. Additionally, it boasts high accuracy within its large measuring range of 30-130dB at +/-1dB precision for accurate readings over extended periods of use.