ESMARTER COB Keychain Work Light – Bright, Compact & Always Ready

Meet your new everyday carry essential. The ESMARTER COB Keychain Work Light packs serious brightness into a pocket-sized clip-on design, giving you reliable illumination wherever you go — from late-night trail runs and camping trips to roadside repairs and emergency situations. With 8 versatile light modes, a built-in battery level display, and USB-C recharging, this mini LED light is engineered for real-world versatility.

8 Light Modes — One-Hand Operation

Cycle through all modes with simple single-press button clicks:

Press 1: High-brightness white light
Press 2: Low-brightness white light
Press 3: High-brightness warm light
Press 4: Low-brightness warm light
Press 5: Steady red light (signaling & visibility)
Press 6: Flashing red light (emergency signaling)
+ Additional strobe & standby modes

Switch between modes effortlessly with one hand — no fumbling in the dark.

Long-Lasting Battery with Display Indicator

Built-in 500mAh lithium battery — included, no extra purchase needed
Up to ~2 hours on high brightness, ~5 hours on low brightness
Battery level display so you're never caught off guard
Type-C fast charging — fully charged in approximately 1 hour

Compact, Durable & Clip-Ready

Attaches to keys, backpacks, belt loops, or bags via integrated keychain clip
Lightweight and pocket-friendly — take it camping, hiking, running, or keep it in your car
COB LED technology delivers wide-angle, high-lumen output in a tiny form factor
Red light modes ideal for low-light visibility signaling during outdoor activities

Key Specifications

Brand	ESMARTER
Model	W5138
Light Source	COB LED
Light Modes	8 modes (white, warm, red, strobe)
Battery	Built-in 500mAh Lithium (included)
Charging	Type-C USB
Charge Time	~1 hour
Run Time	2–5 hours (mode dependent)
Country of Origin	Made in China

Great For

🏕️ Camping & backpacking
🥾 Hiking & trail running
🚗 Roadside emergencies & car repairs
🔧 Workshop & under-hood work
🏠 Home power outages
🎒 Everyday carry (EDC)

Explore More from Our Store

For guidance on outdoor safety lighting and signaling, visit the Ready.gov Emergency Supply Kit recommendations to see why a reliable portable light source is a must-have for any preparedness kit.

Frequently Asked Questions

Q: How many light modes does the ESMARTER COB keychain light have?

A: The ESMARTER W5138 COB keychain light features 8 light modes, including high and low brightness white light, high and low brightness warm light, steady red light, and flashing red light (plus additional strobe/standby modes). You can cycle through all modes with single presses of the button — easy to use with one hand.

Q: How do I charge the COB keychain light and how long does the battery last?

A: The light recharges via a standard Type-C USB cable in approximately 1 hour. The built-in 500mAh lithium battery provides around 2 hours of runtime on the highest brightness setting and up to 5 hours on the lowest brightness. A battery level indicator display lets you monitor charge status at a glance.

Q: Is this keychain LED light suitable for camping and hiking?

A: Absolutely. The compact, clip-on keychain design attaches easily to backpacks, belt loops, or keys, making it ideal for camping, hiking, trail running, and other outdoor activities. The red and flashing red modes are especially useful for low-light visibility and signaling when outdoors.

Q: Does the light come with a battery included?

A: Yes! The ESMARTER COB keychain work light includes a built-in rechargeable lithium battery — no additional batteries required. Simply charge via Type-C USB and you're ready to go.