The XP3 Quest is the only phone available with an IP67 rating – making it completely dust resistant and waterproof in depths of up to 3.3 feet. The XP3 Quest is tested to Sonim’s stringent Rugged Performance Standard (http://www.sonimtech.com/rps.php), developed to ensure the highest standard for rugged phones. For example, the Sonim XP3 Quest: * provides top-line lithium ion batteries capable of providing 1500 hours of standby time and up to 18 hours of talk time. This is suitable for miners spending days at a time working underground; * equips all its phones with customised keypads and widely spaced