Display :LED Screen Atmospheric pressure: 86Kpa - 106Kpa Sampling time: 1.5 seconds Detection temperature: -10C to 50C; Relative humidity: 20% - 85% Storage temperature: -10C to 60C; Power source: Lithium battery with 2000 mAh capacity; 5V DC power charging Product weight: 350g Measuring range:30~130dBA Detection for Noise : Electret Condenser microphone Processor:ARM ,High-speed complex calculations Colour:black+white Material: ABS Size:270 x 90 x 35mm Package Contents: 1 x Decibel Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.