How long will battery last when using the red light?

The red light lasts about 2 hours

What's the waterproof level of this cob small keychain flashlight?

IPX-4 standard waterproof,it is good for a rain from any angle or just normal getting wet.Great rechargeable flashlight.

When the battery dies completly can it be changed out?

These are rechargeable with a micro USB cable. Not sure what the actual battery life is, there are high and low settings as well red and a red strobe light setting.

What does "cob" mean?

Dear Friend, thanks for your queation. "cob" mean this light is made of unique advanced technology, so this cob keychain work light the lighting effect is better, doesn't get hot easily and have longer life which can be use for a long time.

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Description

🔦 Light Up Your Hustle, Wherever It Takes You

HANDS FREE VERSATILITY - Magnetic bracket and 160° foldable handle let you clip, hang, or stick your light exactly where you need it.
FOUR MODES FOR EVERY MOMENT - Switch seamlessly between bright, low, red, and flashing red light modes to match your environment and mood.
BLINDING BRIGHTNESS ON DEMAND - Illuminate your world with a powerful 1000-lumen COB LED—never miss a detail, day or night.
ALL DAY POWER NO STRINGS ATTACHED - Recharge quickly via USB-C and enjoy up to 3 hours of continuous, reliable light.
BUILT TOUGH FOR THE URBAN ADVENTURER - IPX4 water resistance and durable ABS + aluminum construction keep you shining through rain, hikes, or late-night runs.

The SEFONE Keychain Flashlight 2 Pack delivers a compact powerhouse with 1000 lumens brightness, a rechargeable 650mAh battery, and versatile mounting options including a magnetic bracket and foldable handle. Designed for professionals on the move, it offers four lighting modes and durable, water-resistant construction—perfect for biking, fishing, running, or emergency use. With USB-C charging and a built-in bottle opener, it’s the ultimate everyday carry essential that blends utility with style.

Specifications

Special Feature	Dimmable Mode, Keychain, Lightweight, Magnetic, Rechargeable
Color	Round-2PCS
Power Source	Battery Powered
Light Source Type	LED
Material	Abs, Aluminum
White Brightness	1000 Lumens
Included Components	Usb Cable
Product Dimensions	0.98"D x 1.96"W x 2.55"H
Voltage	3.6 Volts (DC)
Battery Cell Composition	Lithium
Item Weight	1.59 ounces
Number of Batteries	1 Lithium Ion batteries required. (included)
Water Resistance Level	Waterproof
Brand	SEFONE
Brightness	1000 Lux
Battery Description	Lithium Ion Battery
Style	keychain
Finish Type	Anodized
Light Source Wattage	6.67 Watts
Mounting Type	Keychain
Recommended Uses For Product	indoor or outdoor
Manufacturer	SEFONE
UPC	782917319115
Part Number	sf-11
Item model number	sf-11
Batteries	1 Lithium Ion batteries required. (included)
Item Package Quantity	2
Shape	Round
Finish types	Anodized
Number of Lights	1
Specific Uses	Hiking
Special Features	Dimmable Mode, Keychain, Lightweight, Magnetic, Rechargeable
Batteries Included?	Yes
Batteries Required?	Yes
Wattage	6.67 Watts
Bulb Features	High brightness, multiple light modes, waterproof
Average Life	3 Hours

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