Does a cheap picatinny vertical foregrip LED light work?

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Zconmotarich Foregrip Flashlight, High Power LED Light, Handheld Rail Mount Aluminum 20mm Black

UTG 400 lumen quick detach grip light is their original design bringing you not only a bright, 400 lumen weapon light, but an ergonomic vertical foregrip together in a single package! Designed specifically for close quarters and medium range engagement, it features precision reflectors that provide a broad flood light pattern for maximum periphery illumination.

Features:
Three hours of run time with 2x CR123A batteries
400 lumens of bright output with wide flood pattern
Ergonomic knurled aluminum vertical grip
Easy to use push button activation
Weighs just 12 oz