I am only going to use this in strobe blinking for self-defense, Would this work and be effective during day and night?

Yes. The strobe is very strong.

Location of serial number, for my records, please?

The location of the serial number is located near the head of the flashlight.

Is it waterproof or water resistant?

The TM20K has an IP Rating of IP68.

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Description

🔦 Light up your legacy with the TM20K—where power meets precision.

COMPACT COMMAND - Under 6 inches and featherlight at 14.9 oz, designed for ergonomic grip and ambidextrous use—power meets portability.
ALL WEATHER WARRIOR - Built tough with HA III hard anodized finish and waterproof rating—your reliable companion rain or shine.
BLINDING BRIGHTNESS - Illuminate your world with a staggering 20,000 lumens that reach up to 317 yards—never miss a detail in the dark.
RAPID RECHARGE POWER - Quick Charge USB-C support means you’re back to full brightness in just 4.5 hours—stay powered, stay unstoppable.
VERSATILE LIGHTING MODES - Instant access to turbo, strobe, spotlight, floodlight, and lock modes—customize your beam for every mission.

The Nitecore TM20K is a professional-grade, USB-C rechargeable LED flashlight delivering an extraordinary 20,000 lumens with a beam distance of 317 yards. Featuring a robust 9600mAh lithium-ion battery with Quick Charge support, it offers rapid recharge in 4.5 hours. Compact and lightweight with an ergonomic flat grip, it includes multiple lighting modes such as turbo, strobe, spotlight, floodlight, and lock mode. Constructed from HA III hard anodized aluminum, it is waterproof and built for durability, making it the ultimate tool for professionals and enthusiasts who demand unmatched brightness and reliability.

Specifications

Special Feature	Lightweight
Color	Black
Power Source	Battery Powered
Light Source Type	LED
Material	Aluminum
White Brightness	20000 Lumens
Included Components	Battery, Flashlight, Holster, USB-C Charging Cable
Product Dimensions	5.73"D x 1.97"W x 1.97"H
Voltage	3.7 Volts
Battery Cell Composition	Lithium Ion
Item Weight	14.89 Ounces
Number of Batteries	1 Lithium Ion batteries required. (included)
Water Resistance Level	Waterproof
Warranty Type	Manufacturer Warranty
Brand	Nitecore
Brightness	20000 Lumen
Battery Description	Lithium-Ion
Finish Type	HA III Hard Anodized
Manufacturer	Sysmax
Part Number	TM20K+KEY
Item Weight	14.9 ounces
Item model number	TM20K+KEY
Batteries	1 Lithium Ion batteries required. (included)
Item Package Quantity	1
Shape	Cylindrical with flat side
Finish types	HA III Hard Anodized
Number of Lights	19
Special Features	Lightweight
Batteries Included?	Yes
Batteries Required?	Yes
Bulb Features	Turbo Mode, Strobe Mode, Spotlight, Floodlight, Lock Mode

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