Feature 1Maximum/minimum value measurement and data retention function, can measure the volume more easily. 2Data recording function, data measurement and collection are more convenient. 3Realtime display of results, with fast/slow response modes to choose from. 4Scientific design, the test process is more accurate, and the test data is more rigorous. 5The product is small in size, light in weight, easy to transport and convenient to useItem Type: Noise TesterMaterial: PlasticSize: Approx. 23x7cm / 9.1x2.8inWeight: Approx. 618g / 21.8ozSensor: 1/2 Inch Condenser MicrophoneMeasuring Range: 30~130dBA/35~130dBCMeasurement Accuracy: 1.5dBFrequency Response: 31.5Hz~8.5KHzFrequency Weighting: A/CDigits: 5 DigitsResolution: 01dBTime Weighting: Fast/SlowMaximum Lock: SupportPower Supply: 4x1.5V AA Batteries (Batteries Not Included) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Noise Tester (Battery Not Included)1 x Manual1 x Power Cord1 x Circle ProtectorNote1. Do not place it in a high temperature or humid place.2. The ambient noise must be lower than the noise of the measured object before it can be measured normally.3. Please take out the battery if you don't use it for a long time to avoid electrolyte leakage and damage the meter.