Hardware KOL · Engineer

Jimmy Chung.

I review the SKYTAG family of trackers and the Smart Ring SR-2026. I design them too. Real engineering, real picks.

See all 7 reviews

Hi, I'm Jimmy.

Hardware engineer. Founded Skytech Creations Limited in 2011. Apple MFi License #120974. Engineering in China. Factories in Thailand and Dongguan/China.

I've designed every product on this page. Every spec, every PCB, every BOM line. I review them the same way I built them — honestly, with the limitations called out.

13+
Years engineering
100K+
Units shipped
50+
Countries served
#120974
Apple MFi license
FEATURED — Health Monitor Ring

Smart Ring SR-2026.

A health-tracking ring that looks like jewelry. Real production prototype from the Dongguan factory line.

HR + SpO2 7-day battery IP68 Sleep tracking Titanium
See the Smart Ring →
Reviews

Seven products. One I won't sell you.

Five shipping, one still in R&D. Each one reviewed by the engineer who built it.. Each one reviewed by the engineer who built it.

Smart Ring SR-2026 — Gold-tone titanium smart ring with amber inlay
Health Monitor
Real prototype
Health Monitor Ring
Smart Ring SR-2026
Gold-tone titanium smart ring with amber-resin inlay. Real production prototype — health tracker that looks like jewelry. HR + SpO2 + sleep + 7-day battery + IP68.
From $185 Real prototype · Pilot inquiries welcome
SKYTAG Button
Bestseller · Shipping
SKYTAG Button
Single-button keychain finder. 100dB buzzer, IP65, replaceable CR2032, Apple Find My.
$29 retail 5/5
SKYTAG I
Original · Shipping
SKYTAG I
The original 2018 tracker. IP67, 1-year battery, Apple Find My. Still works after 7 years.
$25 retail 5/5
SKYTAG II
Flagship · Shipping
SKYTAG II
UWB precision finding. 400m range, 2-year battery, IP68. Worth the upgrade for big houses.
$45 retail 4.5/5
SKYTAG Coin — coin-shaped tracker with built-in magnet
In production
SKYTAG Coin
2mm thin. CR2032 battery (240mAh). Built-in neodymium magnet snaps onto any metal surface. Half the depth of an AirTag.
$35 Coin · 2mm
SKYTAG Card
Shipping
SKYTAG Card
Credit card shape, 1.5mm thin. Qi wireless charging. Slides in any wallet.
$35 retail 5/5
SKYTAG Bike
Specialized · Shipping
SKYTAG Bike
GPS + Bluetooth dual-mode. Tamper alert. For serious cyclists, not $200 commuters.
$79 retail 5/5

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NEW · Module 1 live

Muse Gadget

A Wi-Fi companion device with a friendly AI mascot. Designed in-house, manufactured in Dongguan — same team as SKYTAG.

Wi-Fi 6 5" Color Display USB-C AI Mascot
Order now →
Muse Gadget — Wi-Fi companion device

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R&D Robotics

OpenDuck.

My side project — open-source bipedal robot. Hardware, firmware, vision, all documented in the open. Where I prototype ideas that might someday show up in our products.

See the project →