I bought these brand new and they went dead after one week of use. It was frustrating to open the plastic packaging - I really prefer cardboard packaging or Amazon’s frustration-free packaging, but this is clearly designed for store retail. they are very comfortable and the piece between the toes is leather and soft. Dont know why the description still mentions CL15 but then you can run this at CAS15 at a lower frequency. They seemed to be a reasonably good sandal, but the inner sole has worn out. Not good for vacations. It does take some pressure to plug it in - more than youd think - but when it does connect there is a satisfying snap. I have a Bontrager Pro Wrench stand. These slippers are totally awful. Ive bought sketcher sandles before, but i must say these that i bought from hirano.