Do students need to read numbers to understand the noise level?

No. The 32-column bar uses quiet green, moderate amber, and loud red thresholds from your paired phone's microphone — an approximate visual cue, not a calibrated decibel meter.

Can I run a clean-up timer without a projector or phone?

Yes. Tap Pad 1 and the sleeve runs a silent CLEAN UP 03:00 countdown along your forearm that the whole class can watch.

Can the sleeve actually measure room noise?

Your paired phone's microphone estimates ambient loudness over BLE (uncalibrated, not a decibel meter), and the 8×32 bar visualizes it in real time.

Use Case #31 · Cluster D · Stage, Studio & Performance Pros · All 50 Modes

Classroom Teacher Visual Noise-Level Thermometer & Transition Timer

Show the room its own volume: a 32-column green/amber/red noise thermometer and a silent CLEAN UP 03:00 countdown on your teaching forearm — $199.

Students watch the bar: Quiet green, moderate amber, and loud red thresholds from your paired phone's microphone — an approximate visual cue, not a calibrated decibel meter.
Silent transitions: Tap Pad 1 for a CLEAN UP 03:00 countdown; 5 sewn fabric pads run it with no projector, phone, or raised voice.
Ready out of the box: Ships as one of the 50 built-in modes; set thresholds and timers 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 live music, crowd and audio modes on the forearm sleeve. Concept render · simulated 8×32 display · first production run of 500 units.

Why Phone, Watch, and Projector Timers Fail a Quiet Classroom Transition

You can't project a phone timer: Shouting over thirty kids to start clean-up wrecks the calm you were trying to protect.
A cue on your body: The sleeve turns a few inches of fabric into a glanceable surface that stays where your hands already are.
Peer-reviewed textile roots, shipping hardware: The Oct 2026 NUS Nature paper coined “garment GUI” with a lab-only woven pixel fibre (not for sale); our shipping $199 sleeve uses 5 sewn conductive-fabric pads and a removable 8×32 LED pod.

What Each Forearm Pad Does (Pads 1–5)

Pad 1 (Elbow)Single tap — Start / stop the CLEAN UP transition timer · LED cue: Silent CLEAN UP 03:00 countdown

Pad 2 (Upper Mid)Press & hold — Reset the timer to the last preset · LED cue: Timer flashes 00:00

Pad 3 (Center)Swipe — Cycle noise thresholds (quiet / group / centers) · LED cue: Green/amber/red bar re-scales

Pad 4 (Lower Mid)Double tap — Silent mode: hide numbers, show only the bar · LED cue: Color bar only, no digits

Pad 5 (Wrist)Single tap — Teacher glance: current loudness cue + time remaining · LED cue: Dim QUIET · 03:00

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

Frequently Asked Questions

Do students need to read numbers to understand the noise level?: No. The 32-column bar uses quiet green, moderate amber, and loud red thresholds from your paired phone's microphone — an approximate visual cue, not a calibrated decibel meter.
Can I run a clean-up timer without a projector or phone?: Yes. Tap Pad 1 and the sleeve runs a silent CLEAN UP 03:00 countdown along your forearm that the whole class can watch.
Can the sleeve actually measure room noise?: Your paired phone's microphone estimates ambient loudness over BLE (uncalibrated, not a decibel meter), and the 8×32 bar visualizes it in real time.

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.