5.4  Headphone / external microphone  
The side of the telephone features a 3.5 mm jack connector for headphone / external microphone. 
Contact your retailer for information on the various headphone models available. 
5.5  Cleaning your telephone  
Your telephone does not require any particular servicing. However, it may be cleaned using a soft, damp 
cloth. 
Use appropriate soap or detergent to clean the surface of the telephone. 
5.6  Transporting and protecting your telephone  
Your telephone can also be carried in a protective case with swivel clip 
(not supplied with the phone, please contact your installation 
technician). It is recommended to use the protective case if your 
telephone is to be used in an industrial environment (presence of dust, 
filings, vapors of diverse origins or its at the risk of being dropped). To 
avoid losing your telephone, get into the habit of clipping it onto your 
belt. 
Insert the phone into the protective case (top end of the phone first). 
Make sure that the protective case is correctly closed.