Feature: 1. Digital Screen: The decibel meter adopts 13in large screen to clearly view the real time decibel level, temperature and humidity, with adjustable brightness. 2. Alarm Prompt: The default alarm value for power on is 130dB. When the measured value exceeds the alarm value, the decibel meter will emit an alarm sound. 3. Good Cooling: The meter back panel is designed with multiple heat dissipation vents, which is safe and durable, suitable for long term operation. 4. Level Display Bar: With analog bar level indication, 6 bars noise decibel display, 30-75dB display is green, 76-130dB display is red, clear and intuitive. 5. Easy Installation: The sound level meter is wall hanging, easy to install, and has a bracket, which can be placed on the desktop, for different scenes. Specification: Item Type: Sound Level Meter Material: ABS, LED Color: Black Measuring Range: 30dB-130dB Accuracy: 1.5dB (subject to standard sound source, 94dB at 1KHz) Frequency Response: 31.5Hz-8.5KHz Frequency Weight: A Weight Response Time: FAST, 0.5 Seconds Sensor Type: 6mm condenser microphone sensor Digital Display: 3 Digits Resolution: 0.1dB (100dB) Alarm Prompt Mode: Sound and Display Alarm Output: 12V High Level Refreshing Speed: 2 times per second Power Supply Mode: DC5V 1A Micro USB Interface Working Temperature and Humidity: 0-40 Maximum 80 percent relative humidity, indoor altitude