Auto Ranging Frequency weighting: A/C Fast/Slow time weighting selection Max Hold function High Accuracy Bar graph display AC/DC function White Backlight Over / Under indicator Time and date display Auto-off function setup Low Battery Alert Tripod Mount (Tripod not included with USB cable for power supply CE Certified & RoHS Compliant Standard applied: IEC651 type 2, ANSI S1.4 type 2 Calibration sound source: 94dB @ 1kHz Measurement range: 30~130dBA Accuracy: 1.5dB(reference sound pressure standard, 94dB@1KHz) Frequency response: 31.5~8.5KHz Resolution: 0.1dB Measurement weighting: A/C Analogy bar graph: 2dB/1 Bar graph increment Display update time: 2 times/second (FAST), 1 time/second (SLOW) AC signal output: 4Vrms/ full barograph, output impedance is approx 600 ohm DC signal output: 33mV/dB Sampling rate: FAST (125ms) / SLOW (1s) Dynamic characteristic: FAST (high speed) / SLOW (low speed) Power supply: 4 x AA Size 1.5V battery or USB power cable Item Weight: 7.4 ounces Product Dimension: 9 x 2.5 x 1.5 inches Shipping Weight: 13.6 ounces Shipping Dimension: 9.6 x 4 x 2 inches Comes With 1 x Sound Level Meter 1 x English User Manual 1 x AC/DC line 1 x USB Power Cable 4 x AA Battery 1 x Carrying Pouch