AASTRA DT292 for BusinessPhone User Guide EN - Manual (Page 107)

107 DT292
Reference
Maintenance
Consider these suggestions and guidelines to keep your phone in
good shape and working properly.
Note: The phone does not contain user-serviceable parts.
If you phone requires service, you should return it to the
supplier or retailer where you bought it.
Intrinsic safety
Do not use the phone and charger in conditions where there is a
danger of electrically ignited explosions.
Battery disposal
Defective batteries must be returned to a collection point for
chemical waste disposal.
Treatment
Do not expose the phone and charger to long periods of direct
sunlight. Keep the phone and charger away from excessive heat
and moisture.
Cleaning
Clean your phone with a soft cloth moistened with water only. The
use of soap and other cleaning products can discolour and
damage the phone. Clean the battery contacts using ethanol or
isopropyl alcohol.