PAA3 Seven hours of continuous operation with four AA batteries 31-band EQ setting value display (Boost/Cut) RT60 measurement Built-in calibrated measurement microphone Phase checker Noise generator with pink noise, 1kHz and polarity test signal, balanced output Memory and average calculation function SPL meter calibration through sound level calibrator Sound Pressure Level Meter from 30 dB~130 dB Line signal measurement display in dBu, dBV, or Volts (AC) SPL meter and level meter have three level range selections Maximum level, Peak hold displays XLR input and output sockets USB interface for desktop software control Audio test signal CD and supporting software Three power modes: (1) Power Save (2) On (3) Off Operates seven hours with four AA batteries AC power adapter included The PAA3 is a highly accurate handheld audio analyzer that gives sound engineers a rich array of sound analysis tools. Features include 31-band real time spectrum analysis, RT60, SPL and line meter, internal generator, EQ setting program, microphone calibration and speaker phase checking abilities. All functions and menus can be accessed through a central jog dial, leaving your other hand free to adjust audio settings. Easily upload information and settings to your computer via the built-in USB interface. The large LCD screen has a visible backlight to help you see in a dark performance environment. And with a battery life of 7 hours, the PAA3 is the multifunctional tool for every serious audio engineer.