device complies with IEC61672-1 Class2 for sound level meters normal and peak mode data management: stored or real-time over range indicator A & C weighted fast & slow response software calibration manual and automatic start mode Specifications accuracy: ± 1.4dB frequency range: 31.5Hz to 8kHz dynamic range: 50dB measuring range: 30dB to 130dB data memory (measuring points): 129920 sampling rate: 1s ~ 24h frequency weighting: A, C time weighting: fast (125ms), slow (1s) microphone: 1/2" electret condenser microphone data output: USB power supply: 1x 3.6V battery 14250 (LS14250, incl.) average operating time with full battery : 200 hrs. consumption: 5.5mA (stand-by = 30µA) operation temperature / humidity: 0 - 40°C (32 - 104°F) / 10~90%RH operating altitude: < 2000m storage temperature / humidity: -10 - 60°C (14 - 140°F) / 10%~75%RH dimensions: 130 x 30 x 25mm weight: 20g system requirements: Windows 2000 / XP / Vista hardware requirements: min. 8MB memory, 2MB disk space, free USB port accessories: user manual, battery, windscreen, CD, transparent cap