4 GHz- On-unit Run, Pause, and Skip buttons for when WiFi is unavailable--- Rachio 1 and 2 do not provide this functionalityCONS- Comes in a bland, gray color. Still; for $20 it’s worth the money. Not ordering again . Easy to put together, and the flexibility of choosing side-by-side or stacked really helps with our closet space. It is exactly as described as shown in the pictures. Im pretty impressed with the sound and ease of use of these truly wireless earbuds. I could have called Amazon to complain and try to make them replace it. (for example in Dream Theaters "Pull Me Under" there is a very low bass note in the intro that these headphones pick up its one of the first tests I put on speakers) but correspondingly the lower the frequency, the lower the volume in the mix. Are. The plastic piece was sheared again.