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Own Your Shelf

Carl's Cellular

This is a representative use case. Carl's Cellular is an illustrative customer, but the technology, Envoy device repurposing, system integration, and Sentinel architecture described here are fully built and production-ready.
SENTINEL

Phones Selling Phones

Old trade-ins become full-color shelf displays. E-ink tags in the glass case. Live pricing everywhere — updated automatically.

Industry Phone Repair & Resale
Data Source Integrated
Catalog ~60 SKUs (rotating)
12 TAG35s
40 Envoy Phones
1 Beacon
$0 Per Envoy Display
The Challenge

Carl repairs and sells used phones. His inventory turns over constantly — a phone arrives, gets graded, priced, and shelved. Paper tags fall off, prices go stale, and customers want to see specs before they ask. Meanwhile, Carl has a drawer full of trade-in phones worth maybe five bucks each — cracked screens, dead batteries, missing SIM trays. Too broken to sell, too functional to recycle.

📱

Envoy: E-Waste to Infrastructure

Trade-in phones that aren't worth reselling become full-color shelf displays. Factory reset, connect to WiFi, sideload the Envoy app — cracked screen, broken speaker, none of it matters. If it can render a web page, it's a shelf label.

40 Envoy devices · $0 each

TAG35 Glass Case

The premium glass case gets real e-ink tags for a clean, professional look. No charging cables visible, no screen glare — just crisp black-and-white pricing that looks like it belongs in a flagship store.

TAG35 · 12 tags

Live Price Sync

Carl updates a price in the system and walks away. The TAG35 in the glass case and the Envoy phone on the shelf both update automatically. Carrier lock status, battery health, warranty info — all pulled from custom data fields.

Automatic sync · Zero manual updates
🎨

Full-Color Product Photos

Envoy phones show full-color product photos, spec sheets, and comparison charts — impossible on e-ink tags. Customers browse specs on the shelf label before they even pick up the product.

Rich media · Photo + specs
Sentinel Simplicity — No Commander, no VPN, no on-site server. One Beacon handles the TAG35 tags via BLE. The 40 Envoy phones connect over store WiFi. Everything runs from the cloud — Carl's total hardware footprint is one small box plugged into his router.

“I had a drawer full of trade-ins worth maybe five bucks each. Now they're my shelf labels — full color photos, live pricing, and I didn't spend a dime on them.”

On Envoy

“Customers love it. They pick up a phone to look at the price and I tell them ‘that phone IS the price tag.’ Gets a laugh every time.”

On the conversation starter

“I update the system and walk away. The glass case tags update, the shelf phones update. I don't even think about it anymore.”

On live pricing

“The cracked Galaxy S7 that nobody wanted? It's been showing prices for six months straight. Best use that phone ever had.”

On e-waste reuse

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