Measuring range:30-130dB Sample Rate FAST:125ms Sample Rate SLOW:1Sec Noise accuracy:2dB Frequency response range:30Hz-8KHz Resolution:0.1dB Automatic shutdown:If there is no operation after about 15 minutes of startup,it automatically shut down. Mimic strip:Yes Data retention:Yes Maximum/Minimum:Yes Backlit bright screen:Yes Undervoltage indication:Yes Battery model:2 x 1.5V AAA batteries(Not included batteries) Color:Black Material:ABS Package Contents: 1 * Decibel Meter Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.