Features SENSITIVE DETECTION: The noise meter is equipped with high accuracy sensor and sensitive 1/2in condenser microphone, which features fast instantaneous response! THRESHOLD VALUE ADJUSTABLE: Upper and lower alarm thresholds can be set, you can make adjustments according to your actual needs. RED LIGHT ALARM: When the measurement is higher or lower than the set threshold value, the red background light on the screen lights up and the measurement value flashes to indicate the alarm. BACKLIT LCD SCREEN: With a backlit LCD screen, the meter is very convenient to work at night or in any dark place. EASY CARRYING: Comes with small size and lightweight, you can easily take the noise meter with you to help with your work. Specification: Item Type: Sound Level Meter Material: ABS Color: Black Measuring Range: 30-130dBA Accuracy: ± 1.5dB Accuracy: ± 1.5dB (at the reference sound pressure level, 94dB at 1kHz ) Resolution: 0.1dB Environment Temperature Range: 0 to 60℃ Temperature Accuracy: ± 2℃ Noise Display: Four digit display, maximum 1999 Frequency Response: 125Hz to 8kHz Analog Bar: 1 scale represents 2dB Overload: OVER, Hi, UNDER, LO Microphone: Highly sensitive 1/2 inch condenser microphone Time Weight: FAST 0.125 seconds, SLOW 1 second Sampling Rate: 2 times/second Automatic Shutdown: 10 minutes (can be closed manually) Operating Environment: - 10 to 50℃, maximum 80% relative humidity, indoor altitude less than Approx. 2000m / 6561.7ft Storage Environment: - 10 to 50℃, maximum 70% relative humidity (take out the battery) Display Size: Approx. 37 x 41mm / 1.46 x 1.61in Power Supply: 1. 5V AAA battery x 3 (without battery) Package List:1 x Sound Level Meter1 x Cloth Bag 1 x Manual Package List 1 x Sound Level Meter 1 x Cloth Bag 1 x Manual