Features 1、LCD screen, easy to read, noise measurement is 30-130dB. 2、Changeable sampling rate, fast is 125ms, slow is 1s. 3、1/2 inch condenser microphone. 4、Can convert ambient sound into electric signal and process data. 5、Compact size, easy to carry. Specification Description: UT353 portable digital sound meter can convert ambient sound into electric signal and process data. It has compact design and easy to operate with user friendly interface. Bluetooth function is added for data transfer and analysis on mobile App. Features: LCD screen, easy to read, noise measurement is 30-130dB. Changeable sampling rate, fast is 125ms, slow is 1s. 1/2 inch condenser microphone. Can convert ambient sound into electric signal and process data. Compact size, easy to carry. Specification: Brand: UNI-T Model: UT353BT Bluetooth: 4.0 Storage: 1G and above Battery type: 1.5V 3*AAA battery(NOT INCLUDED) Compatibility: For ios 8.4 and above, for android 4.3 and above Bluetooth app: iENV app Size: Approx. 15.5*5.2*3cm / 6.1*2.0*1.2inch Weight: 167g Specifications Range Resolution Accuracy Noise (A Weighting) 30~130dB 0.1dB ±1.5dB Frequency response 31.5Hz~8kHz Features Sampling rate Fast 8/s Slow 1/s Overload indication OL/UN MAX/MIN Yes Data hold Yes LCD backlight Yes Auto power off 5 minutes Low battery indication 3.0~3.5V USB interface Yes Tripod mount Yes Full battery duration >12hrs with Bluetooth function on Working environment 0~30° C (≤80%RH) 30~40° C (≤80%RH) 40~50° C (≤45%RH) Storage environment -20~60° C (≤80%RH) Note: For ios devices, please download Bluetooth app in AppStore. For Android, please download in PlayStore or you can log in the official website: www.uni-trend.com.cn Package Included: 1 x Sound Level Meter Package List