How does the sleeve get live train times with no cell signal in the tunnel?

The paired phone fetches the ETA while you have signal, caches it on the BLE controller, and the sleeve runs the countdown locally. In a dead zone the bar keeps draining from the last refresh, and Pad 1 re-syncs the moment you regain a signal.

Can I set it for my own line and stop?

Yes. Open the Sleeve Studio app, edit the lines and saved stop in the mode, then send it to the sleeve over Bluetooth in about 30 seconds.

Is the countdown bar readable while wearing a winter coat?

The sleeve is worn on the outer forearm over or under a coat cuff. Pull the compression sleeve over your jacket sleeve to keep the 8×32 LED matrix exposed and readable at shoulder height.

Use Case #18 · Cluster C · Commute, Transit & Urban Navigation · All 50 Modes

Subway Platform Transfer Countdown Strip on Your Forearm

A live 32-column RGB LED strip shows the seconds until your next L-train — CARS 3-5 marks your boarding spot — on the 8×32 matrix so you never lean past the yellow line to read a tiny board. Five conductive-fabric pads refresh or switch lines. $199 finished sleeve.

Skip the crush: A 32-column countdown bar and a boarding-car hint (CARS 3–5) sit on your raised forearm, not 40 feet away behind 300 people.
Hands stay free: 5 sewn fabric pads refresh the ETA or switch lines without unlocking a phone that loses signal underground.
Pre-loaded & customizable: Ships as one of 50 built-in modes; set your own lines and saved commute in the Sleeve Studio app.

Preorder Sleeve · $199 Free US Shipping Try in Sleeve Studio →

▶ See the 8×32 Forearm Display in Action

Watch the 8×32 RGB LED matrix and 5 conductive-fabric touch pads running cycling, running, navigation and commute modes on the forearm sleeve. Concept render · simulated 8×32 display · first production run of 500 units.

Why Crowded Subway Platforms Hide the Train Clock

No leaning past the yellow line: Read the countdown in your peripheral vision instead of straining toward the platform board through a crowd.
Works with no signal: The phone caches the ETA and the sleeve keeps counting down three floors underground.
Coat-friendly: Wear the compression sleeve over your jacket cuff so the bar stays readable at shoulder height, then hand-wash off the rail dust.

What Each Forearm Pad Does (Pads 1–5)

Pad 1 (Elbow)Single tap — Pull live ETA from paired phone (transit API cache) · LED cue: 32-column bar fills; "L 2:14" scrolls once

Pad 2 (Upper Mid)Swipe — Cycle line: L → 7 → A/C/E · LED cue: Line letter scrolls; accent switches cyan → purple → blue

Pad 3 (Center)Double tap — Cycle saved commute stop · LED cue: Scrolls "CARS 3-5 · BEDFORD AV" in one pass

Pad 4 (Lower Mid)Press & hold — Toggle 32-column bar ↔ minute count only · LED cue: Bar drains one column per 4 seconds at 2:00

Pad 5 (Wrist)Press & hold — Silence for tunnel dead zone · LED cue: Dims to 25% with last-known countdown locked

Customize in 30 seconds: Pick this mode in the Sleeve Studio app, type or speak new words, colors, or pad actions, and tap Send over Bluetooth — no code.

Frequently Asked Questions

How does the sleeve get live train times with no cell signal in the tunnel?: The paired phone fetches the ETA while you have signal, caches it on the BLE controller, and the sleeve runs the countdown locally. In a dead zone the bar keeps draining from the last refresh, and Pad 1 re-syncs the moment you regain a signal.
Can I set it for my own line and stop?: Yes. Open the Sleeve Studio app, edit the lines and saved stop in the mode, then send it to the sleeve over Bluetooth in about 30 seconds.
Is the countdown bar readable while wearing a winter coat?: The sleeve is worn on the outer forearm over or under a coat cuff. Pull the compression sleeve over your jacket sleeve to keep the 8×32 LED matrix exposed and readable at shoulder height.

Run This Mode on Your Forearm — Reserve Batch 01 ($199)

Complete hardware + 50 modes ($199): 8×32 RGB LED matrix (256 pixels), 5 sewn conductive-fabric touch pads, and a 5-second slide-out washable electronics pod.
Sleeve Studio app ships first: Personalize all 50 modes in plain words before your sleeve arrives (small monthly subscription; zero code).
Zero-risk preorder: First run of 500 units (~30 days to production), free US shipping, 100% refund anytime before shipping + 90-day money-back guarantee.

Preorder Sleeve · $199 Free US Shipping Open Sleeve Studio Full Hardware Specs

Watch → Prove → Buy

Not ready to order yet? Take the next step.

See the hardware in motion, read the peer-reviewed textile research behind it, or reserve your spot in the first production run of 500 sleeves.

STEP 1Watch the sleeve in action Five soft touch pads, an 8×32 RGB LED display, Bluetooth, and a removable electronics pod for gentle washing. See the hardware → STEP 2See how the app customizes any mode Pick from 50 pre-built modes or type a new one in plain words. The Sleeve Studio app ships before your hardware. See Sleeve Studio → STEP 3Preorder the Sleeve — $199 First run of 500. ~30 days to production. Free US shipping. Full refund anytime before it ships. Order now →

90-day money-back guarantee, plus a full refund any time before the sleeve ships.

Questions about your setup? Call +1 725-338-4835 or email alex@midnightdev.dev.