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.", Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!