NOTE: Connecting computer with USB cable, you can down-load records, collect samples and print chart and date,etc.Wall hanging type. With the hanging hole, it can installed on the wall to or free stand on the table. If the product you purchased cannot be connected to the software, please contact the seller and update the software version. After the start of the meter, save every two seconds.You can observe the noise changes through th line chart, which will be more intuitive. Kindly Note: Please do not use the sound meter in high temperature, high humidity, heavy dust, chemical gas environment The Sound Level Meter is versatile device for measuring sound intensity in an acoustic envieronment-lound or soft; high pitched, low-pitched, or Broad-band; inter-mittent or continuous, This meter can be used in measuring noise of various occasions and addpiances such as factory, office, home, traffic route, acoustics, air-conditior refrigerator, etc. Specification: Measure Range: 30 to 130dB Accuracy: ?1.5dB(reference sound pressure level, 94dB@1KHz) Frequency Range: 31.5Hz to 8.5KHz Frequency Weighting: A Response Time: Fast Microphone: 6MM Capacitance Microphone Display: 3pcs - 3inch digitals display Resolution: 0.1dB( 100dB), 1dB( 100dB) Alarm Reminder: Yes, Sound+Display Alarm Output: Yes Storage Function: 2 secs/time, can be stored for a year Commuication: Connecting PC via USB cable for down-load records, collect samples and print chart and date Power Supply: DC 5V 1A Micro USB Outlet Operation Condition: 0 to 40C, 10 to 80% RH Storage: -10 to 60C, 10-70% RH Dimension: 210x130x28mm Weight: 450g Package Included: 1 x SW-525B Wall Mounted Sound Meter Level 1 x USB Cable 1 x Manual 1. Measuring range: 30 to 130dB, the product operation is very convenient, it can be used only by connecting the power supply (additional power supply needs 5V 1A) accuracy: 1.5dB (reference sound pressure level, 94dB @ 1KHz), frequency response range: 31.5Hz ~8.5KHz 2. Large 9.6-inch LCD display with backlight, powered by DC 5V 1A Micro USB socket, this meter can be used to measure noise in various occasions and accessories, such as factories, offices, homes, traffic routes, audio, air-conditioning refrigerators, etc. Wait 3. Alarm switch setting: short press the "horn button" to turn off the alarm and the red light goes out, then press the "horn button" to turn on the alarm, and the red light is on. In the normal measurement state, long press the "horn key" to enter the alarm setting, adjust the alarm value through the up and down keys, short press the "horn key" to save the alarm value, or short press the "power key" to cancel the setting. 4. Note: Power on, short press the "switch machine" button to shut down, long press the "switch machine" button, automatic startup function: the product will automatically turn on when connected to the power supply, long press the "switch machine" button, it will shut down, if LCD display appears The numbers on the screen do not jump, and garbled characters appear. You need to restart the machine. If you have any questions, please contact us in time. 5. Note: The device needs an additional charger, which matches the standard 5V 1A charger. The voltage and current must not exceed 5V 1A. If it is too large, it will burn the circuit board. When using the sensor, please pay attention to whether there is any blockage of foreign matter. If the device is turned on, the LCD display does not display, and the sensor may be faulty. Please contact us in time, we will handle it for you as soon as possible.