Data storage: In the product section of the sound level meter, you can refer to the English manual. The instrument automatically stores data every 2 seconds, and the stored value is the largest noise value in 2, which can last a year. Large Screen: Super large 9.6 LCD digital display with backlight makes reading more clear and visual in dark areas. Alarm function: You can easily set an alarm threshold. When the alarm is triggered, the measurement is stored and the value reached begins to flash for an adjustable period of 6 to 120 seconds and an audible signal sounds. When the measured value exceeds the alarm value, the sound beeps and locks the data flashing for 2 minutes. USB powered: By connecting a computer with a USB cable, you can download recordings, collect samples, and print maps, dates, etc. Wall Mount Type: With the hanging hole, it can be installed on the wall or free standing on the table. It can be used for families, factories, offices, hotels, hospitals, laboratories, theaters and audio systems, etc. Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it