Upgraded Wireless Bluetooth 5.3 Headphones Compared with traditional sport Earbuds, Bluetooth 5.3 technology provides a stable wireless connections to your Smartphones. Inside 70mAh capacity battery on each bud ,up to 8 hours playing time. Never worry about low battery when you are out all day. Comfortable & secure fit Flexible & secure-fit ear hooks keep keep the earbuds in place when moving or working out, soft ear tips and ergonomic design offers comfortable wearing experience.And ensure your sports earbuds stay comfortably firm in place when doing sports, running, hiking, jogging & other outside activity etc,do not worry about the earbuds will fall off. HD Sound Quality After making numerous professional experiments and testing, Cshidworld makes these wireless sports Bluetooth headphones, it delivers very clean sound without distortion even at high volume. The bass is rich and sound crisp. Noise cancelling works also excellent because of a snug fit.