✅ This product is marketed and sold by ONLY "AmazonPro" brand which offers a 13 year special replacement guarantee throughout India. Our policy successful warranty claims will be covered by replacing a new product unit for our warranty process, please contact us at our brand help line number which is printed on our warranty card that you will receive with our product packaging box. ✅NEW UPGRADED 5.1 CHIPE: Constant full-core upgrade, compared to the old Bluetooth 5.0 version, the transmission distance has been greatly improved, signal stability and interference resistance ability, and reduce power consumption in standby mode✅Charging method: Headphone charge: put the earphone in the charging compartment, the earphone will be automatically charged, and the red earpiece will light when charging, and will light when full. Charging in the charging hole: after connecting the data cable, the red light will light in the charging hole, and the red light will come out when fully charged