Specifications: Model:TA650A Range: 30.0~130dBA Accuracy: +1.5 dB (sound pressure reference, 94 dB at 1 kHz) Resolution: 0.1dB Frequency rating: dBA Display: 4 digits, max. 1999 Frequency response: 31.5Hz ~ 8kHz Microphone: High precision 1/2 inch microphone Time weighing: FAST: 0.125 s, SLOW: 1 s Sampling rate: 2 times/s Auto power off: 15 minutes (can be disabled) Working environment: -10~50, max 80%RH altitude indoor <2000m Storage environment: -10 ~ 50C, max. 70% relative humidity (battery removed) Product size: 167 x 59 x 31mm Screen size: 34 x 31 mm Weight approx. 114g (battery not included) Power: 2 x 1.5V AAA (RO3/LRO3) Characteristics: Large selection Measuring range: 30.0 ~ 130 dBA; Accuracy: +1.5dB Time weighting Lightly press the F/S button to switch between FAST/SLOW. Max Min Lightly press the MAX button to lock the maximum value, and lightly press the MIN button to lock the minimum value. High precision sensor Highly sensitive 1/2 inch condenser microphone with high precision, high sensitivity and fast response. HD large screen display The screen has a white backlight that can be turned on by pressing the button; Display size: 34 x 31 mm. Power supply mode/auto power off Use 2x1.5V AAA (RO3/LR03) AA batteries (not included); It will automatically turn off after 15 minutes of no operation (can be canceled manually). Scope of delivery: 1xcolor box 1x host 1x cloth bag 1xInstructions 1xCertificate of Conformity Note: Battery (not included)