This Centechia model M1-TWS earbuds has quality stereo sounds that make you think you are at the concert and not just listening to the music. They are so conferrable you will forget that you have them in your ears. They are built using the latest CVC8.0 digital noise reduction technology and they are Bluetooth compatible. This set of earbuds use the M1 Bluetooth chip and the Jerry 6963 chip and is compatible with any devise that also uses Bluetooth version v5.1. The tune quality is crystal clear with the active notice cancelling technology and an impedance range is up to 32 Ω and the earbuds battery capacity is 50mah. This earbud set has a waterproof ratting of IPX7 making them sweat proof and waterproof. It is also Apple and Siri support and is compatibility with Xiaomi, Huawei LG, Samsung, iPhone phone along with any other Mobil devises that use Bluetooth v5.1 and it employs the latest TWS binaural stereo technology. The case is the charger for the earbuds, the charging box battery capacity is 2000mah and has a standby time of 12 hours, and the earbuds have a playing time of 3 hours. A USB cable is used to charge the case and the case charges the earbuds. What comes in the package with the earbuds is 1-pair of wireless earbuds (left & right), 1-charging case, 1-USB charging cable, 4-ear cap, and the user manual.