Ledlenser New K4R Rechargeable LED Key Ring Torch

The Ledlenser K4R has been updated to provide a higher output and offers a slightly different design, yet remains a stylish and compact rechargeable key ring torch. It has 80 lumens on the highest constant power setting, or a maximum of 120 lumens on the boost setting which will only last for 10 seconds at a time.

Charging the built-in 180 mAh lithium-ion battery is super easy, as the K4R features a diamond knurled fold out USB-A interface which plugs directly into a USB power source saving the need for extra cables, and for convenient charging on the go. The LED charging indicator on the front will go red to show charging is in progress and turn green once charging is complete after approximately 3 hours.

A single push button operates the torch, which is nestled under the fold out USB-A interface, however it can be operated with the USB connector in the closed position by pressing the top of the diamond pattern. Single presses of the button will cycle through low, high and off, or if you are in any mode for longer than 5 seconds the next press will turn the light off instead of cycling the modes.

You can double press the button within 5 seconds to access the boost mode while the torch is on or off, and the boost will last for 10 seconds before reverting to the last used mode. When the light is first turned on the LED indicator will briefly light up either green, yellow or red to notify the user of remaining battery power. When it reaches red the torch has less than 25% power and it should be charged as soon as possible.

To prevent accidental activation when not in use, the K4R has a lockout function which can be activated by holding the button down for 5 seconds while the light is off and it will blink white twice to confirm it is locked out. To unlock it again simply hold the button for 2 seconds and it will blink twice before entering the low mode.

For easy carry the light features a small carabiner clip to attach it to your keys, so it is always to hand when you need it.

Please note: The K4R is not protected against water ingress, therefore it is not advised to use the torch in wet conditions or in areas where it can be potentially dropped in water.

Product Features

Built-in rechargeable lithium-ion battery
Integrated USB-A charging interface
Single switch offers access to all functions
Features wide beam to light up peripheral vision
Carabiner key ring connector attached

Operational Modes

Low: 20 lumens; 3 hours, 30 minutes run-time; 10 m beam range
High: 80 lumens; 1 hour run-time; 25 m beam range
Boost: 120 lumens; 30 m beam range*

Tested according to ANSI FL1 standard using the built-in 550 mAh lithium-ion rechargeable battery. These results are average values which in individual cases can deviate by ± 15% for technical reasons.

*The boost mode can be used multiple times, however only last for 10 seconds at a time, and may not be available if the battery level is too low.

Technical Details

Type: Key ring LED torch
Operating Modes: Low / High / Boost
Luminous Flux: Up to 120 lumens
Beam Range: Up to 30 m
Lamp Type: 1 x power LED
Batteries Required: 180 mAh lithium-ion battery (built-in)
Charging Time: 3 hours
Measurements: 52 x 25 x 11 mm
Weight: 20 grams
Body Colour: Grey or rose gold
Body Material: ABS (head and base) and aluminium Alloy (body)
Environmental: Dust resistant to IP2X standard
Warranty: 2 years

Packaging and Contents

Supplied in retail packaging and includes:
Ledlenser New K4R key ring torch x 1
Carabiner clip x 1
Quick user guide x 1