This USB rechargeable UV flashlight pen is a compact and versatile detection tool designed for everyday use. Featuring a powerful ultraviolet (blacklight) LED, it easily reveals invisible stains, pet urine, counterfeit currency marks, and fluorescent materials. The sleek pen-style design is lightweight and portable, making it convenient to carry in pockets, bags, or toolkits. Equipped with a built-in rechargeable battery and USB charging port, it eliminates the need for disposable batteries, offering a more eco-friendly and cost-effective solution. Ideal for pet owners, home inspection, travel, security checks, and cleaning verification. It also serves as a practical promotional item for cleaning brands, inspection services, veterinary clinics, and retail giveaways. Custom logo printing is available for enhanced brand exposure.