I've used these for a little less than a month after purchase, but the fit wasn't right for me, so I'm putting them up for sale. I'm also including a set of ALZA ear tips. This is a set of 3 sizes: S, M, and L (M size is already attached to the main unit). I've disposed of the outer box for the ear tips, so I'll include only the ear tips themselves. There are no initial defects, and the sound quality is not an issue. Bose QuietComfort Ultra Earbuds with noise-canceling function. - Brand: BOSE - Model Name: QuietComfort Ultra - Features: Noise Canceling - Included items: Charging case Thank you for looking.