Descriptions: 1. Digital Sound Level meter, noise meter. Site Noise Measurement, Factory Noise Measurement, Engine Noise measurement 2. Large screen digital display. 3. Multiple functions are measured in real time. 4. LCD HD backlight digital display. 5. Polarized capacitive microphone. Short response time, strong anti-interference ability, more accurate data acquisition. 6. Fast/slow dual measurement modes: FAST/SLOW time input, one-key switch Specifications Range: 30-130dBA Accuracy: ±1.5dB(94dB@1KHz), ±5dB(94dB@8KHz) frequency response: 30Hz-8KHz Frequency weighting: A Time weight: FAST 125ms, SLOW 1sec Microphone: Polarized capacitance microphone Temperature: -20℃~60℃(-4℉~140℉)/±1.5℃ Humidity: 0~100% /±5.0% Bargraph: Yes Data hold: Yes Backlight: Yes MAX/MIN hold: Yes Auto Power Off: Yes Low battery indication: Yes Battery Type: DC 1.5V 3*AAA Size: 142x58mm Package List: 1 * Decibel Meter 1 * Storage Bag 1 * User Manual (English)