Sennheiser - HD550 Open-back Headphones

The following cases are not covered by the above warranties:

minor faults or deviations in the quality of a product which do not affect the product’s value or fitness for its intended purpose
any accessories supplied with the product
rechargeable or disposable batteries (these products have a shorter service life, the length of which also depends on the frequency of use)
faults resulting from improper use (e.g. operating errors, mechanical damage, incorrect operating voltage) Proper use for the purposes of these warranties are defined as use of the product under the conditions stated in the instructions for use
faults due to wear and tear
any modification of products effected by the end user or a third party, unless Sonova Consumer Hearing GmbH has given its prior written consent to the nature and extent of the modification. For the avoidance of doubt, approved modifications will not void the warranty.
faults due to force majeure
faults of which the purchaser was already aware at the time of purchase

All warranty claims become void if the product is tampered with by unauthorised people or repair shops. Further, the warranty is voided by removal or alteration of identification labels, serial numbers or safety labels on the product or its parts.