The BK-1 headset has five buttons that perform all of its functions, including turning it on and off, pairing to other devices, receiving and rejecting phone calls, selecting intercom channels, adjusting the volume, and enabling and disabling several features.
The main button for everything is the Mobile Phone button, which powers the unit on and off, pairs and connects to mobile device, and answers, rejects or ends phone calls. The volume buttons adjust the volume up or down (obviously), checks the battery level, mutes the sound, and enable/disable AGC and VOX functionality. The volume buttons also house the indicator LEDs, which is either flashing or solid colors, in red, blue and occasionally purple. The LEDs indicate a plethora of statuses and conditions, including battery levels, modes (active, standby and charging), powering up and down, and features enabled/disabled, and pairing setup. In addition, specific tones will be heard from the speakers, depending on modal changes, whether it’s from power, intercom and mobile devices. The Channel A and Channel B buttons connect you to an already paired BK-1 on the same channel, and also facilitate paring the intercom devices.
The first thing to decide is whether you want the BK-1 headset attached along the top or rear section of the helmet. I installed it in both areas, and found that the rear was less obtrusive, made routing the speaker wires easier, and allowed me to use a helmet mounted POV video camera. Regardless of the spot that is chosen, follow their detailed instructions (which sort of confused me) for installing the headset cradle, using either the short or long Velcro strap. After installing the cradle, figure out where the speakers will fit the best in the bottom rear of the helmet, and apply the appropriate sized Velcro stick-on loop pad (either the large or medium) to that spot, and wait 10 minutes. I am really not sure if it matters if you wait 10 minutes, since sticky pads of any sort don’t adhere to EPS foam very well (more on that later).
Attach the Velcro speaker booms to their counterparts inside the helmet, and route the wires outwards to the cradle, connect them together, and then snap the cable’s audio connector into the cradle’s socket.
Install a freshly charged headset into the cradle, by snagging its front end on the cradle’s hook, and then push its rear down until it snaps in place.