146Appendix EMaintenanceThe NavTalk Pilot is a state-of-the-art device and should receive proper care.To receive the most benefit from your unit and extended product life, pleasefollow these recommended procedures for care and maintenance.Do not store the NavTalk Pilot in hot areas, such as a closed automobile.High temperatures can shorten the life of electronic components, damage thebattery pack and cause malfunction of the unit. If storing in your car forextended periods, place the unit under a seat and away from direct sunlight. Indirect sunlight the unit may gain enough heat to be uncomfortable to hold againstyour head during use. Always allow the unit to cool down before use whenexposed to temperatures in excess of 112 degrees F. The closed interior of yourcar or its trunk compartment can reach temperatures approaching 120 degrees Fon hot, sunny days.Clean only with a mild soap and water solution. Do not use harsh cleaners,solvents, or detergents as they may attack plastic surfaces, (in particular the lensof the LCD display).Do not attempt to open the phone case. This will damage waterproofingseals. The NavTalk Pilot is designed for disassembly by trained technicians only.Do not drop or otherwise impact the unit as rough handling may damageinternal circuit boards and other electronic components.Do not allow children to play with the unit or its accessories. Improperhandling and function key sequencing may remove some of your stored data.Do not use any other battery charger or external power supply than thoseprovided for use with the NavTalk Pilot.