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.

Hi, I'm Jimmy.

Hardware engineer. Founded Skytech Creations Limited in 2011. Apple MFi License #120974. Factory in Dongguan, engineering in Bangkok.

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

Reviews

Seven products. One I won't sell you.

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

Bestseller · Shipping

SKYTAG Button

Single-button keychain finder. 100dB buzzer, IP65, replaceable CR2032, Apple Find My.

$29 retail 5/5

Original · Shipping

SKYTAG I

The original 2018 tracker. IP67, 1-year battery, Apple Find My. Still works after 7 years.

$25 retail 5/5

Flagship · Shipping

SKYTAG II

UWB precision finding. 400m range, 2-year battery, IP68. Worth the upgrade for big houses.

$45 retail 4.5/5

Pre-order Q1 2027

SKYTAG Coin

2mm thin. CR2032 battery (240mAh). Built-in neodymium magnet snaps onto any metal surface. Half the depth of an AirTag.

$35 pre-order Coin · 2mm

Shipping

SKYTAG Card

Credit card shape, 1.5mm thin. Qi wireless charging. Slides in any wallet.

$35 retail 5/5

Specialized · Shipping

SKYTAG Bike

GPS + Bluetooth dual-mode. Tamper alert. For serious cyclists, not $200 commuters.

$79 retail 5/5

Health tracker

Smart Ring SR-2026

Gold-tone titanium smart ring with amber-resin inlay. HR + SpO2 + sleep tracking. Real prototype.

TBD Pre-release

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 →