Function Range Resolution Accuracy Description Sound Level 30-130dB 0.1dB ±1.5dB Rate response: 31.5Hz-8KHz Sampling Time Fast/Slow 125ms/1000ms Overload indication Shows "UN" and "OL" MAX/MIN Measurement Shows "MAX/MIN" Data Hold/Backlight Shows "HOLD" and turns backlight on or off Auto Power off Automatically power off after 5mins without operation Low battery indication 3.0-3.5V Shows low battery prompt when power is 3.0-3.5V Battery: 3 * AAA 1.5V batteries(Not included) Size: 150 * 52 *27mm Weight: 116g Package: 1 * sound meters 1 * Blister 1 * English munual