ELECRAFT K4 - LEFT-SIDE CONTROLS; POWER AND TUNE CONTROLS

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Speakers + Phones menu entry is set to Yes. It may take up to 3
seconds to for front headphone plug insertion or removal to be
detected.
NOTE: Some headphones (e.g. Bose QC35) or other audio devices
have a capacitor in series with their plug. These will not work with the
front phones jack unless a resistor (typically 15-51 ohms) is added in
parallel. The front phones jack depends on the transducer providing a
resistance path to ground when inserted.
USB
This is a USB type A jack. Like the two type A jacks on the rear panel, it may
be used with a keyboard, wireless keyboard, USB flash memory device,
Elecraft K-Pod, mouse, or mouse transceiver module. The front USB jack
can provide up to 900 mA max to peripheral devices (400 mA
recommended).
LEFT-SIDE CONTROLS
The group of switches to the left of the LCD includes transmit and antenna
functions and the power on/off switch.
POWER
Tap [POWER] to turn the K4's power on or off.
NOTE: Always turn the K4 off using its power switch. If you need to turn off
the power supply as well, wait until the K4 has completely powered down.
(This may take several seconds. You'll hear a number of relays turning off.)
TUNE
Tap [TUNE] to enter tune mode at the power level set by the {XMTR} <PWR>
knob function. This puts out a CW signal in any operating mode.