ESMARTER Mini Keychain Flashlight – USB-C, IP66, UV & Magnet

ESMARTER Y41 Mini Keychain Flashlight – Mighty Illumination in a Pocket-Sized Package

Meet the ESMARTER Y41 Mini Keychain Flashlight — a powerhouse of light that slips right onto your keys. Barely the width of a finger and weighing just 18g, this compact torch punches well above its size with a blazing 400 lumens in its brightest mode, five dimming levels, UV side light, magnetic tail, and a built-in 500mAh battery charged to full in just 35 minutes via USB-C. Whether you're navigating a dark trail, checking authenticity of banknotes, or signalling in an emergency, the Y41 has you covered.

Key Features

• Ultrabright 400LM Main Beam – T20 LED with 6500K daylight colour temperature and up to 50 m illumination range.
• 5 Main Light Modes – Extremely Bright (400LM) → High (290LM) → Medium (87LM) → Low (25LM) → Energy-Saving (2LM, up to 32 hrs runtime).
• Multi-Mode Side Lights – White, White Strobe, UV/Violet, Red, Red Strobe, and alternating Red-Blue flash for visibility and signalling.
• UV Light Function – Ideal for banknote verification and fluorescent agent detection.
• Magnetic Tail Cap – Snap it to any metal surface (car roof, toolbox, tent pole) for hands-free, tool-free mounting; pairs perfectly with the warning flash modes as an emergency beacon.
• USB-C Fast Charging – Fully charges in just 35 minutes; charging indicator glows red while charging and turns green when complete.
• IP66 Waterproof & Drop-Resistant – Rated IP66 and withstands drops from up to 1.5 m.
• RoHS Certified – Free from high-concern chemicals, safe and eco-conscious construction.
• Overcharge & Over-Discharge Protection – Smart circuitry protects the 500mAh polymer lithium battery automatically.
• Keychain-Ready Design – Slim 15.6 × 60.5 mm body clips straight onto any keyring, bag, or lanyard.

Product Specifications

Runtime Reference

Perfect Everyday Carry Companion

From late-night walks and camping trips to car breakdowns and power outages, the Y41 is the flashlight you'll forget is on your keychain — until you really need it. It also makes a thoughtful gift for outdoor enthusiasts, commuters, and anyone who values preparedness.

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For more information on flashlight and portable lighting safety standards, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Flashlight

Frequently Asked Questions

Q: Does the ESMARTER Y41 mini keychain flashlight come with a battery included?

A: Yes! The Y41 features a built-in 500mAh polymer lithium battery that comes pre-installed. Simply charge it via the USB-C port and it's ready to use straight out of the box.

Q: How long does it take to fully charge the Y41 flashlight?

A: The Y41 charges from empty to full in approximately 35 minutes using any standard USB-C cable and 5V power source. The indicator light glows red during charging and switches to green when fully charged.

Q: Is the Y41 keychain flashlight truly waterproof?

A: Yes, the Y41 carries an IP66 waterproof rating, meaning it is protected against powerful water jets from any direction. It also survives drops of up to 1.5 metres, making it highly durable for outdoor and everyday use.

Q: What does the UV/violet light function do?

A: The UV side light is useful for verifying banknotes, detecting fluorescent agents on surfaces, and other everyday tasks that require UV illumination. It is accessed via the side light cycling modes.

Q: How does the magnetic tail cap work?

A: The magnetic tail cap allows the flashlight to attach securely to any ferrous metal surface — such as a car body, toolbox lid, or metal shelf — leaving your hands completely free. When combined with the red or red-blue flashing side light modes, it functions as a highly visible emergency warning beacon.