A. Display: LED screen B. Air pressure: 86 kPa - 106 kPa C. Sampling time: 1.5 seconds D. Detection temperature: -10°C to 50°C E. Relative humidity: 20% - 85% F. Storage temperature: -10°C to 60°C G. Power supply: 2000 mAh lithium battery; 5V DC charging H. Product weight: 350 grams I. Measurement range: 30 - 130 decibels J. Noise detection: Electret condenser microphone K. Processor: ARM, capable of high - speed and complex calculations L. Color: Black and white color scheme M. Material: ABS N. Dimensions: 270 x 90 x 35 mm O. Package contents: 1 sound level meter The package contains mainly the above contents. Note: Light reflection and different displays may cause slight differences between the color of the item in the picture and the actual product. The allowable measurement error is +/- 1 - 3 cm.