Features： 1、11in LED Screen: This sound level meter has 4 in 1 function and 11in LED display, and is the sound meter, thermometer, hygrometer and clock 4 in 1. And is the great tool for checking, monitoring or controlling and testing any environmental sound level. 2、WIFI and APP Function: This sound meter supports 2.4G WIFI and for Tuya and you can find the data in APP and make the phone connects to the device via wifi and for tuya APP. 3、Semiconductor Sensor: Our LED decibel meter has smart air semiconductor sensor to test decibel temperature and humidity values and very accurate and sensitive. 4、Brightness Adjustment: You can click up icon to enhance the decibel meter brightness, click down icon to reduce the brightness. There are three gears of detection speed, fast, medium speed and slow speed 5、Battery and 10ft Charging Cable: Our LED sound meter is built in 2000mAh lithium battery power, with the 10ft USB charging cable and double click M to adjust the time. 6、Wide Application: This sound level meter is suitable for classrooms, studios, major traffic arteries, factories, construction sites, homes, offices. Specification： Item Type: Sound Level Meter Material: ABS Display Method: LED Screen Atmospheric Pressure: 12.5PSI-15.4PSI Sampling Time: 0.3S Detection Temperature Range: -10-+50℃, ±1.0℃ accuracy Storage Temperature: -10 - 60℃ Operating Environment Or Storage Humidity: 10% - 80% Detection Humidity Range: 20% - 85% (Accuracy: 5%) Charge: 1000mA 5VDC Battery: 1 X 18650 2000 MAh (Shipped With Built-In Battery) Unit: DBA Measurement Range: 30 - 130dBA Accuracy: ±1.5dBA Frequency Range: 50Hz-8.5kHz Frequency Weighting: A Screen Display: 0.1 DBA Sound Meter Level (Unit DB). Green 1: 55.0 Or Less Green 2: 65.0-55.0 Orange 1: 75.0-65.0 Orange 2: 85.0-75.0 Red1: 95.0-85.0 Red 2: 95.0 Or More Level Of Temperature Icons (Unit ℃). Green: 20-30 Orange: Below 20 Red: Above 30℃ Package List： 1 x Sound Level Meter 1 x Instruction Manual 1 x USB Cable 1 x Installation Sticker 2 x Screws 2 x Expansion Screws