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The KAF2 provides an elliptic, L-C low-pass filter, and a narrow band-pass filter for CW or data use. The low-pass filter rolls off noise and high-frequency QRM while having no impact on speech or data signals. The low-noise, two-stage, active band-pass filter helps pull in weak CW signals, and can be turned on or off from the front panel.In addition to two audio filter settings, the KAF2 includes a real-time 24-hour clock/calendar with its own multi-year backup battery. Just tap the DISPLAY button to see the time or date on the K2's LCD! Great for field trips--no need to take along a digital clock. Supports MM/DD and DD/MM date formats.