ArmourLite Isobrite Valor Series - Black Dial & T100 Tritium - Rubber - 200mWith this mid size ISO351 watch from ArmourLite, you get the great features of the Valor Series watches, but a smaller case size at 39. 5mm. Nonetheless the T100 Tritium hands and markers will never leave you in the dark. Illumination: Swiss Made T100 tritium markers Functions Features: Date display Movement: Swiss Made Ronda 505 quartz Battery Life: 45 months Crystal: Scratch resistant sapphire with anti reflective coating Case Diameter: 39. 5mm Case