I purchased these last year and have been using them about every three days. The deep bass is very satisfying. They are app-compatible, allowing you to customize the sound to your liking. I used them with a case and screen protector, so there are no visible scratches. Battery degradation isn't noticeable at all. These are wireless earbuds featuring adaptive noise cancellation and boast a battery life of up to 40 hours. - Model Name: TOUR PRO 2 - Features: Adaptive Noise Cancelling - Charging Method: Wireless Charging - Battery Life: Up to 40 hours - Case Features: Smart Case - Call Function: Perfect Call Thank you for looking.