1. Mini digital sound level meter with stable and reliable performance. 2. Wide measuring range, from 30dB to 130dBA. 3. Data hold function, measuring maximum and minimum values. 4. The LCD display is backlit, making it easy to use at night. 5. Low battery indicator, automatic and manual shutdown function. 6. Small and lightweight, easy to hold and carry. 7. Equipped with a sponge ball to protect the sensor. 1.Model: AS804 2. Material: ABS plastic. 3. Display: 5-digit LCD display, maximum display 99999. 4. Measuring range: 30-130dBA 5. Resolution: 0.1 dB 6. Accuracy: 1.5 dB (under reference conditions) 7. Frequency range: 31.5 Hz to 8.5 Hz 8. Frequency weighting: A 9. About the oscilloscope: LCD display 10. Weighing time: fast 11. Sampling rate: 2 times/second 12. Operating temperature: 0-40 (10% ~ 80% RH). 13. Storage temperature: -10-60 (10%~70%RH). Power supply: AAA size battery*3pcs (not included) Size: 152*52*27mm Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.