Features： 1、[4 in 1 Function] The meter comes with 11 inch LED screen, could display sound level, temperature, humidity and time, brightness adjustable, very practical. 2、[High Accuracy] The sound level meter uses intelligent air semiconductor sensor to test the decibel, temperature and humidity value, which is more sensitive, accurate and stable. 3、[Widely Used] This decibel meter can be hung on the wall or placed on the table, ideal for testing sound level in classroom, studio, main traffic arteries, factory, construction site, home, office, etc. 4、[Easy to Use] This intelligent decibel meter is available at any time, easy to adjust brightness, detection speed and time. The detection speed has three gears: fast, medium and slow. 5、[USB Rechargeable] This decibel meter has a built in 2000mAh lithium battery power supply, and is equipped with a 10ft USB charging cable, you can charge easily. Specification： Item Type: Decibel Meter Material: ABS Display method: LED screen Atmospheric Pressure: 12.5PSI to 15.4PSI Sampling Time: 0.3S Detection Temperature Range: 14℉ to 122℉ Storage Temperature: 14℉ to 140℉ Working Environment Storage Humidity: 10%-80% Detection Humidity Range: 20% to 85% (Accuracy: 5%) Charging: 1000mA 5V DC Battery: 1 x 18650 2000mAh (Built in) Unit: dBA Measuring Range: 30-130 dBA Accurate: ±1.5dBA Frequency Range: 50Hz to 8.5kHz Frequency Weighting: A Screen Display: 0.1 dBA Noise Meter Level (Unit: dB): Green 1: 55.0 or less Green 2: 65.0 to 55.0 Orange 1: 75.0 to 65.0 Orange 2: 85.0 to 75.0 Red 1: 95.0 to 85.0 Red 2: Above 95.0 Grade of Temperature Smiling Face (Unit: ℉): Green: 68-86 Orange: Below 68 Red: Above 86 Package List： 1 x Decibel Meter 1 x User Manual 1 x USB Cable 1 x Installation Sticker 2 x Screw 2 x Anchor