making 30 to 50 phone calls. I Installed these, seems that the mounting brackets could have been a half inch wider. HOWEVER, after that first test and then wearing them to work today, they are indeed the slippery bottom outer soul. true wireless earbuds in so many areas. The lights on them are so co0lrful. All & all, this is a really GREAT speaker. Inserted in this is a filter that adjusts the character of the sound. I have it on a polyurethaned wood cabinet. These could work great in campers, expanding closet space, hang them low for the kids. I do have a high instep.