TWS wireless earphones with digital display, long-lasting use with a 300mAh battery. These are 3coins earphones, but the bass is great, and the sound quality is so good that you'd think they were high-end wireless earphones. - Model: TWS (T7-KYK) Earphones - Battery Capacity: 300mAh - Charging Method: USB charging - Display: Digital display - Left/Right Indicator: L/R indicator They work without any problems. Sometimes the left earphone makes a faint buzzing sound. It doesn't bother me at all when I'm listening to music, and I can enjoy it. Thank you for looking.