Basic Operation
MFB
Power on
When the device is off, press and hold the Multi-Function Button
(MFB) for 2 seconds to power on. The power-on prompt tone is
"Power on".
Power off
When the device is on, press and hold the MFB for 3 seconds to
power off. The power-off prompt tone is "Power off".
Enter pairing mode
Turn on your phone’s Bluetooth and click "RK4000" to pair to
headset. After a few seconds, a tone will indicate that pairing was
successful. The LED turns to blue and blinks slowly (the blue light
blinks once for 10 seconds).
When playing music, press the MFB to pause / play music.
Double-click the MFB to dial the last call.
Press and hold the MFB for 1 second, then release.
When on a call, hold down the MFB for 2 seconds to switch the
audio between the phone and Bluetooth headset.
Three-way calling
A. When an incoming call occurs during a call, press the MFB
to answer the new call and hang up the current call.
B. Double-click the MFB to answer an incoming call and put the
current call on hold.
C. Press and hold the MFB for 2 seconds to keep the current
call and reject the new call.
D. In a three-way call, double-click the multi-function key to
switch between the current call and the call on hold.
Click the MFB when a call is coming in.
To end a call, click the MFB.
Reject a call
To reject an incoming call, press and hold down the MFB for 1
second to reject the call.
Volume +
Volume up
When talking or playing music, click the Volume + button to
increase volume.
Next song
When playing music, press and hold the Volume + button for 1
second to skip to the next song.
Volume - Volume down
When talking or playing music, click the Volume - button to
decrease volume.
