Sensitive Sensor: Features a 0.5s response time for non-contact measurement. Accurately measures sound levels in any situation, displaying quick and precise readings. LCD Display: Large LCD screen with backlight for easy reading, even at night. Low radiation for reduced exposure. Specifications: Frequency Range: 31.5 Hz to 4 kHz Range: 40 to 130 dB Accuracy: ±3.5 dB (at 94 dB, 1 kHz reference conditions) Resolution: 0.1 dB Frequency Weighting: A-weighting Microphone: 1/2 inch polarized condenser microphone Display: LCD Digits: 3-1/2 digits Response Time: 0.5 seconds Time Weighting: Fast response (125 ms) Alarm Function: Displays 'OL' when input exceeds range Auto Power Off: Automatically shuts off after 15 minutes of inactivity Battery: 9V carbon battery Operating Temperature: 0~40℃ (32~140℉) Operating Humidity: 10-90% RH Storage Temperature: -10~60℃ (14~140℉) Storage Humidity: 10-75% RH Dimensions: 170 x 58 x 35 (mm) Weight: 107 g