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- Uses a Chip-on-Board LED to provide an improved lumen output and visibility
- S.O.S. mode signals for help in morse code in case of emergencies
- Uses a 3.7V lithium-ion rechargeable battery for an impressive max runtime
- Batteries Included?: No
- Rechargeable: Yes
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Description
Ledlenser K4R Rechargeable LED Keylight
Super Compact Design with a Special LED
The Ledlenser K4R takes everything you need in a flashlight and fits it into the palm of your hand. Thanks to its Chip-on-Board LED, the K4R outputs a maximum of 120 lumens, giving you visual clarity with a single press of a button. Paired with its 3.7V lithium-ion rechargeable battery, the K4R runs for a maximum of 1.5 hours, ensuring that you have perfect visibility for as long as you need. When in S.O.S. mode, the flashlight blinks to spell out S.O.S. in Morse code for other people to see your distress in the event of an emergency.
The K4R uses USB-A charging with the included USB cable, allowing you to recharge it almost anywhere at any time. You can even use devices such as your laptop to recharge the K4R. With its Metal Snap Hook, you can easily attach this light to your bag and keys for easy transport, or even attach other accessories directly to it.
| On | S.O.S. | |
| Brightness | 120lumens | 120lumens |
|---|---|---|
| Runtime | 1.5hours | - |
- Notable Features
- » Uses a Chip-on-Board LED for improved lumen output
- » Uses a 3.7V lithium-ion rechargeable battery for an impressive max runtime
- » S.O.S. mode signals for help in morse code with a flashing light in case of emergencies
- » Features USB-A charging for added convenience
- » Metal Snap Hook allows you to attach this light to any bags, keys, or any accessories to this light
Item Details
| Brand | Ledlenser |
| SKU | LEDLENSER-502574 |
| Series | K (Keychain) |
| Manufacturer Part Number | 502574 |
| UPC | 8477066102702 |
| Color | Gray |
| Primary Material | Aluminum |
| Max Lumens (lm) | 120 |
| Rechargeable | Yes |
| Batteries Included? | No |
| Switch | Body |
| Light Color | Neutral White |
| Length | 1.05 in (27 mm) |
| Typical Uses | Walking |
Specifications
| Switch | Body |
| Primary Material | Aluminum |
Output Details
| Max Lumens | 120 |
| Light Color | Neutral White |
Power Details
| Batteries Included? | No |
| Rechargeable | Yes |
| Charge Style | In-Body Rechargeable |
| Charge Connector | USB-A |
Unit Dimensions
| Length | 1.05 in (27 mm) |
| Width | 0.98 in (25 mm) |
| Height | 0.98 in (25 mm) |
| Weight | 2.24 oz (64 g) |
Certifications & Transport
| Certifications/Standards | ANSI |
| Country Of Origin | China |
Packaging/Shipping Dimensions
| Length | 3.39 in |
| Width | 2.83 in |
| Height | 1.35 in |
| Shipping Weight | 0.14 lb |
Additional Details
| Warranty |
Ledlenser 7 Year Warranty Battery Junction Warranty |
| Return Policy | Return Policy |
| Glossary | Flashlight Glossary |
Bright Buys
- Trusted and reliable; consistently rated as a top customer pick for LED flashlights
- Superior 1,600mAh capacity means longer runtimes and less frequent battery changes
- Optimized for both high and low drain devices
- State-of-the-art automated production lines ensure the highest quality and safety protections
- Ideal for low-drain applications that require a primary battery to provide constant power
- 10-year shelf life - stock up for emergencies!
- The best choice for consistent power, great in low-drain devices like remotes
- Safe and reliable - capable of performing in high or low temperatures
- 225mAh capacity drives long runtimes for watches and electronics
- CR2032 coin cells packed with 3V of power
- Convenient 6-piece retail card provides backup batteries
- Easily replaceable primary lithium cells
- Top recommended battery for Apple AirTags
- 11-in-1 card sized tool fits in your wallet or on a keychain!
- Packed with handy tools including a screwdriver & 7 wrench settings
- Serrated saw and straight-edge knife for quick cutting jobs
- Can + bottle openers for campsite meals or end-of-shift relaxation
- Independent 4-slot charging for different batteries
- Touch screen control provides user-friendly operation
- 4 working modes for charging, testing batteries, and more
- Compatible with Li-ion, Ni-Cd, & NiMH batteries
- Quick Charge 3.0 technology enables fast and efficient device charging
- USB compatibility supports a wide range of electronic devices
- Compact adapter design makes it ideal for travel and everyday use
- Intelligent charging management helps optimize power delivery
- Universal cable to consolidate chargers for work, home, or EDC use
- USB-C, Micro-USB, and Lightning plugs for various electronics
- USB-C input with USB-A adapter for use with any USB power source
- 3.93ft long cord, allowing you to use your phone during recharging!
- Premium materials for durability and fast charge speeds
- Fits flashlights w/ diameter of 24-32mm & length of 130mm-170mm
- Great for EDCs, tactical lights, slim lights, & more!
- Durable and flexible nylon material keeps lights secure
- 33g weight won't drag you down!
- Portable powerhouse - emits a 1148ft beam from a 3.4in light!
- Strobe and SOS modes accessible for emergencies
- Dual-fuel power - swap in a CR123A when needed
- Strong magnetic tailcap for hands-free repair jobs
- USB-C port offers seamless recharging from anywhere!
- 3,000 lumens and a 250-meter throw - fierce illumination to light up your backyard
- Multiple output modes are accessible via easy side switch operation
- Strobe, SOS, and beacon modes offer distinct signaling capability
- High-capacity battery supports the light with a maximum 227-hour runtime




