1、1/2in condenser microphone can sensitively detect sound changes. 2、Built-in electronic calibration oscillator for more accurate sound testing. 3、Automatic power-off design can save energy. 4、Compact and lightweight, it is easy to carry. 5、Large screen LCD display for clear reading Features: 1. 1/2in condenser microphone can sensitively detect sound changes. 2. Built-in electronic calibration oscillator for more accurate sound testing. 3. Automatic power-off design can save energy. 4. Compact and lightweight, it is easy to carry. 5. Large screen LCD display for clear reading 6. Suitable for factories, offices, homes, schools and construction sites. Specification: Condition: 100% Brand New Model: HT-80A Material: ABS, Copper Color: Yellow and Black Frequency Range: 31.5Hz-8KHz Measurement Level Range: 30-130dB Accuracy: ±1.5dB (under reference conditions) Resolution: 0.1dB Microphone: 1/2" electret condenser microphone Display: LCD display Display Number: 3 digits Reaction Speed: 0.5 seconds Time Weighting: fast (125mS) Alarm Function: "OL" is displayed when the input is out of range Automatic Shutdown after 15 minutes without operation Power Life: about 50 hours (alkaline battery) Working Temperature: 0-40℃ (32-104℉) Operating Humidity: 10-90% RH Storage Temperature: 10-75% RH Weight: Approx. 200g / 7.1oz Package List: 1 * Noise Tester(windproof sponge ball) 1 * User Manual