The Nokia 5140 is one of the series of durable phones designed to be hard wearing for outdoor and sports activities. The 5140 offers "Enhanced durability and resistance to the elements and usage in sports inspired lifestyle."
The outer shell is tougher than most, and being changeable it can be replaced if it gets scratched or scuffed. The bottom flap helps to protect against water damage, and there is an inner module to provide additional protection against water damage.
The 5140 comes with a range of outdoor "lifestyle" inspired features - camera and video recorder, flashlight, FM radio, thermometer, decibel meter (?), and a good personal organiser with an extensive calendar and notes option.