<p>Quantity: One Set</p> <p>Frequency Range: 31.5 Hz to 8 kHz</p> <p>Measuring Level Range: 30 dB ~ 130 dB</p> <p>Frequency Weighting: A-weighting</p> <p>Microphone: 1/2-inch Electret Condenser Microphone</p> <p>Display: 3-1/2-digit LCD</p> <p>Resolution: 0.1 dB</p> <p>Response Time: &lt;1 second</p> <p>Time Weighting: FAST (125 mS)</p> <p>Accuracy: ±1.5 dB (reference condition 1 kHz, 94 dB).</p> <p>Alarm Function: "OL" is displayed when the input is out of range.</p> <p>Auto Power Off: Auto power off after 10 minutes</p> <p>No action is required.</p> <p>Power supply: 1 x 9V battery, size 6F22. Please note</p> <p>Battery polarity when installing.</p> <p>Battery life: Approx. 50 hours (alkaline batteries not included)</p> <p>Operating temperature: 0°C to 40°C (32°F to 104°F).</p> <p>Working humidity: (10-90)% RH.</p> <p>Storage temperature: -10°C to 60°C (14°F to 140°F).</p> <p>Storage humidity: (10-75)% RH.</p> <p>Dimensions: L×W×H(mm)=190×65×40(mm).</p> <p>Accuracy: The decibel meter provides accurate readings with an accuracy of ±1.5 dB and a resolution of 0.1 dB. Allows you to measure decibels of sound from 32 Hz (e.g., a subwoofer) to 8 kHz (e.g., birdsong).</p> <p>Easy to Use: No complicated operations! Just turn it on and get a reading in less than a second. It's ultra-light at only 0.3 pounds, and its curved design makes it easy to use with one hand.</p> <p>Max/Min Function: Easily switch modes with a single button. The "Max" function displays the maximum noise level within the current measurement range. Use the "H" key to lock the current reading.</p> <p>Clear and flexible control panel: The large backlit LCD display provides clear readings and allows you to collect sound data at night, making this sound meter ideal for use in factories, workshops, schools, homes, etc.</p> <p>Intelligent power saving: When the sound meter is not used for 10 minutes, it will automatically turn off to save energy.</p><p>Good quality product</p>