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We are the ORIGINAL manufacturer of this Invisible UV Pen with battery cabin design. Product description: UV Pen, Invisible Pen, Secret Pen Battery cabin design, easy to change the batteries You can write invisible messages or designs on any dry surface Invisilbe Ink can be readable under a UV light Powered by button cell, the batteries can be mercury-free CPSIA, EN71, F963, ISO8124, CRC-C931, CE, RoHS available Any Pantone color availablePlease contact us for more invisible UV pen if you have any ideas