Ultra Mini Portable Blacklight- Best seller! Solid State portable fluorescent blacklight with Ultra violet output in sturdy highly directional silver metal body. Great for thousands of uses. Operates on three button cell batteries-- and two sets of batteries are included! Illuminates UV Pen marks, Blacklight Posters or other Fluorescent objects Click here to order by fax, or phone! 396 nanometers. Additional information on blacklight uses. Product Number: ULTRA9800