Your user manual should contain a statement confirming the products compliance with the CE regulations if it is to be sold within the European union.  The following is a general sample text which can be included:-

EU – Declaration of Conformity
[Manufacturer Name] declares that [Product Name & Product Number] complies with the essential requirements and other relevant provisions of Directive 1999/5/EC. A copy of the Declaration of conformity is available on request.
[Manufacturer Name]
[Manufacturer Address]

Note that manufacturer in the CE compliance sense refers to the company the product is branded under, not the company that you may sub contract to carry out the actual manufacture for you.

Legal notes:
IBEX UK Ltd makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of fitness for a particular purpose.  IBEX UK Ltd shall not be liable for errors contained herein or for incidental or consequential damages in conjunction with the furnishing, performance or use of this material.  You should ensure that your documentation complies with the requried standards prior to release.