Pit-to-driver comms with the KC-PRO Headset
The headset is your pit wall's seat at the table. Set it up once and your crew can call the driver in, feed lap times and change strategy mid-stint — without hand signals or a pit board.
How it works
The headset is a shell. The module does the talking.
This is the part teams get wrong on day one. The KC-PRO Headset has no battery and no radio of its own — it is speakers, a boom mic and a mount. You clip a KC-PRO module into it, exactly as you would onto a helmet, and that module runs the link.
Speakers and a boom mic
Over-ear cups that shut out the karts around you, and a boom mic that sits in front of your mouth.
A module mount
The same clip you find on a helmet. Any KC-PRO module drops straight into it.
A USB-C cable
Powers the clipped-in module in place, so the pit wall never runs out mid-race.
Setting up the driver's helmet rather than the pit wall? The full setup guide covers helmet audio, mounting the module and your first pairing — this page picks up where that leaves off.
Build it
Set up the pit wall in under two minutes.
Do this once at the start of the day and leave it built. The link comes back on its own every time you power up.
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Clip in the module
Drop a charged KC-PRO module into the headset mount until it clicks. Pull the clip forward to seat it properly.
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Plug in USB-C
Connect the module to a 5 V power source (min. 2 A) so the pit wall runs off mains all day instead of the module's 6-hour battery.
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Power on both ends
Press and hold the helmet + KC-PRO button for 3 seconds on the pit module and on the driver module, until the LED lights and stays on.
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Pair the two
Hold the small helmet button for a couple of seconds on each module. The LEDs alternate red and blue while they look for each other, then settle to a pulsing blue once linked.
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Mic check before the driver leaves
Set the boom mic just in front of your mouth and run a two-way check while the driver is still in the pits. Fix it there, not on lap three.
LED reference
Once paired, the modules remember each other. Power both on within range and they reconnect on their own — there is no need to repeat this before every session.
Position
Where you stand decides how far you reach.
Range is up to 2 km in the open. Concrete and steel are what take it away. Five metres of thought here is worth more than any setting you can change.
Get high
Put the pit unit as high as the paddock allows. Height beats power every time.
Stay clear of metal
Keep away from awnings, trailers, fencing and truck bodies — metal both reflects and absorbs the signal.
Mind the concrete
Thick pit buildings and tunnels cut the link. If you lose the driver on one part of the lap, move before you change anything else.
Face the circuit
Line of sight is everything. Standing behind the pit wall with the track in front of you is the strongest position you will get.
Race-day discipline
Say less, and say it at the right moment.
The link is only worth what you put through it. Teams that talk constantly lose the driver's attention by lap ten; teams that call the three things that matter get faster stints.
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One voice on the wall
Agree who talks to the driver before the session starts. Two people calling different lines is worse than no radio at all.
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Nothing in the braking zone
Hold the call until the driver is on a straight. Information that arrives mid-corner is information thrown away.
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Numbers, not adjectives
“Two tenths up, sector three” lands. “You're doing great” does not.
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Confirm, then stop
Give the call, wait for the driver to acknowledge, then go quiet. Silence is the default state, not a fault.
Brief a new driver on the comms plan in the pits, not on track. Two minutes of agreement before the stint saves a lap of confusion during it.
Reference
A stint call sheet that works.
A starting point for teams new to running comms. Adapt it to your race, then keep it the same all weekend so the driver always knows what is coming.
| Moment | The call |
|---|---|
| Out lap | Radio check, track conditions, and the target lap time for the stint. |
| Laps 2–3 | First real lap time and the gap to the kart you are racing. Nothing else. |
| Mid-stint | The sector where you are losing time, and one thing to change. One, not three. |
| Traffic | Where the kart ahead is, and whether it is a lap down. This is the call a driver cannot make alone. |
| Stop window | Laps remaining before the stop, counted down at five, three and one. |
| In lap | Confirm the box call, then talk the driver through the pit entry and the swap. |
Still stuck on the pit wall?
Tell us your team size and how you are set up, and we will tell you exactly what to run.