In any case the fit was terrible, I had to return the sandal. Playback as a DAC device is fantastic (as is the BTR5, except you cannot change filter settings in this mode with the BTR5; with the UP4 you still can) and in both modes, DAC and Bluetooth, the UP4 sounds fantastic - the differences between the two devices are incredibly subtle, but I would say the UP4 is rounder, warmer, has more low-end definition and the highs are not as elevated while still nicely detailed (not to say the UP4 sounds "warm", only slightly moreso than comparatively to the BTR5 It’s definitely well made to protect your AirPods Pro! We still used our own, much better and stronger tie-downs looped through the x shaped straps on the bag to the Totota cross bars. But really i like. DISAPPOINTED BEYOND WORDS. This is a Win. There is quite a bit of flexibility in the headband. Je lutilise dans le cadre de mon travail car nous navons plus de poste de téléphone classique mais une téléphonie 100% Internet. Apple will probably rubberize the actual buds in the future but for now these are great.