BlackWeb Wireless Earphones Black - Sport Wireless Earbuds with Ear Hooks Waterproof in-Ear Earhook Earphones Bluetooth 5.0 Twinboy Stereo Sound Noise Reduction with Charging Case for Running Gym, Stereo Headset Microphone Pumping Bass Earpiece Noise Canceling. The charging case of the bluetooth earphones built-in 650 mAh battery, could recharge the earbuds 5 times. Once the earbuds is put into the charging case it can be charged automatically. Our wireless earbuds can offer about 4.5 hours of continuous playback after each fully charged. In other words, the charging case provides about 22 hours of use. You could enjoy the music from morning till night. We offer 180 days replacement warranty if have any questions about our earbuds.