Features: LARGE LCD DISPLAY & WALL MOUNT: Our digital sound level meter is equipped with a highdefinition backlit LCD screen, so that you can effortlessly read it throughout the day at your convenience. Unlike handheld sound level meters, our wall-mountable dBmeter is simple to set up and perfect for continuous monitoring. VERSATILE & LONG-LASTING: Our classroom noise meter can be used all over your space. It's wall mountable with a 10ft power cord, flat-bottomed for placing on tables, and lasts for hours unpluggedwith a 2000MaH battery. Also, it can be theater SPLmeter by the TV or in your garage workshop 4 in 1 Design: We have includes HUMIDITY and TEMPERATURE readings in addition to bringing you the bestdecibel meter we could. And the sound level tester has 3 ADJUSTABLE SPEEDS (1. Fast 2. Medium 3. Slow) to make reading it easier, and with Clock function 4 in 1 design WIDE APPLICATIONS:This Large LED displayDecibel Meter can be mounted on the wall or placed on the desk, it is a great noise meter to test the sound level in Classroom, Studio room, traffic routes, factories, construction site, home, offices, etc. Specifications: Measurement range 30-130dB Measurement accuracy 0.1dB Working temperature -10-50℃ Resolution 0.1dB Size approx 220x120x30mm/8.66x4.72x1.18in Charging Time ：approx 6 hours, and it can be used for 10 hours at full charge Package Includes: 1PC Digital Noise Meter note: Due to the problems of lighting effects and shootingangles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.