I am loving these phones and highly recommend them! I dont even know how many pair of Birkenstocks Ive owned over the years BUT this is my first pair with a Soft Footbed and they are sooooooo comfy. The sound is clear and for a smaller speaker it has good bass. It said that the serial couldnt be found so I called customer service. I actually got these to hold my acrylic paints on the inside of my cabinet door. Streaming services work superbly with excellent quality and ease of use. Seem to work OK. I attached it to a 2x6 beam with four screws. Charging time takes an hour and I?ve used it up to 2 hours before it died. After using Sennheiser Ew 100 sets I feel all issues are gone.