Feature: 1. Auto calibration function. 2. Screen brightness can be adjusted by hand. 3. Different colors and expressions face show the quality of the environment, very realistic. 4. You can put it on the table or hung it on the wall. 5. Large screen for easy reading. 6. Large capacity battery for long service time. Specification: This product is a decibel meter that detects noise, temperature and humidity, it combines sensors real-time monitoring of decibel, temperature, and humidity on its display. Features: Auto calibration function. Screen brightness can be adjusted by hand. Different colors and expressions face show the quality of the environment, very realistic. You can put it on the table or hung it on the wall. Large screen for easy reading. Large capacity battery for long service time. Specifications: Color: white Material: ABS Measuring range: 30-130dB Detection temperature: -10°C to 50°C Relative humidity: 20% to 85% Battery: 3.7V, 2000mAh Item size: 270 * 90 * 30mm / 10.6 * 3.5 * 1.2in Item weight: 268g / 9.5ounce Package size: 330 * 100 * 45mm / 13.0 * 3.9 * 1.8in Package weight: 550g / 1.2lb Packing List: 1 * Decibel Meter 1 * User Manual 1 * USB Cable 1 * Set of Installation Tools Package List: 1 * Decibel Meter 1 * User Manual 1 * USB Cable 1 * Set of Installation Tools