Clamshell Compass for Watch Bands or Paracord Bracelets (Photo Luminescent and Oil-filled) Oil-Filled. Highly Luminous (Glow-in-the-dark) face. Lidded housing protects and conceals compass. Working temperature range of -20 degrees F to 120 degrees F. Water resistant to 100 ft (30 m). Fits most watch bands, 1" webbing, and can be woven into a paracord bracelet.