Description 1. Frequency range: 31.5Hz~4kH, range: 40~130dB 2. Accuracy: 3.5dB (at 94dB, 1kHz reference condition), resolution: 0.1dB 3. Sound level frequency weight: A sound level frequency weight 4. Microphone: 1/2-inch polarized condenser microphone 5. Display: LCD display 6. Display digit: 3-1/2 digits 7. Reaction speed: 0.5 seconds 8. Time level: fast response (125mS) 9. Alarm function: "OL" will be displayed when the input exceeds the range 10 Automatic shutdown: automatic shutdown after 15 minutes without any operation 11. Battery: 9V carbon battery 12. Operating temperature: 0~40 (32~140 ) Operating humidity: 10~90% RH Storage temperature: - 10~60 (14~140 ) Storage humidity: 10~75% RH 13. Size: 170X58X35 (mm) 14. Weight: 107g