TX overview

The TX is the half of the system you actually hold. It's small enough to live in a pocket or clip onto a strap, and it does one thing: when you press the marker button, the RX records a marker tone exactly where you pressed it.

Buttons

• Marker button — large, centered. Single press fires a point marker. Press-and-hold creates a duration marker that ends when you release.
• Pair button — small, recessed. Hold for two seconds to enter pairing mode (LED flashes blue); tap once during normal operation to confirm pairing or check link status.

LED behavior

A single RGB LED on the top edge:

• Solid green — paired and ready.
• Brief green flash — marker registered (your press was acknowledged by the RX).
• Flashing blue — pairing mode.
• Solid red — battery low, charge soon.
• Off — powered off or asleep.

For the full color reference including duration-press behavior, see Buttons & LED reference.

Range and latency

• Range: ~100 ft (300 m) line-of-sight. Practical range through walls and floor changes is shorter; we'll publish tested numbers as we exit beta.
• Latency: sub-millisecond press-to-spike over Bluetooth 5.2 LE. The marker tone lands in the recording before your finger leaves the button.

Pairing and channels

Up to four TX buttons pair with one RX. Each TX gets a fixed channel slot (1–4). The marks track on the microSD records per-channel, so an editor can solo channel 1 to see only the director's marks, channel 2 for the DP, and so on.

Pairing is a one-time step per TX — once linked, a TX remembers its slot and will reconnect automatically next time both are powered on. See Pairing & multi-TX for the full sequence.

Power

• Battery: lithium-ion, 12+ hours of active use.
• Charging: USB-C, included cable. ~2 hours from empty to full.
• Self-latching power circuit: zero drain when off.

Mounting

The TX can sit in a pocket, clip onto a belt or strap with the included clip, or live taped to a control surface. There is no hot-shoe mount on the TX itself — it's a hand-held device.