This i11 Wireless Bluetooth Earphones adopts Bluetooth V5.0 + EDR technology, compared with Bluetooth 4.1 or 4.2, the energy consumption of headphones is reduced by 20-30%, the transmission speed is almost 2 times faster, and the stability of Bluetooth is also enhanced. With high-quality speaker, brings you deep stereo bass sound quality. Designed according to the shape of the human ear canal and skin-friendly material, it perfectly presents a fashionable and appropriate shape, let you feel comfortable when enjoying music. Compared with Bluetooth 4.1 or 4.2, the energy consumption of headphones is reduced by 20-30%, the transmission speed is almost 2 times faster, and the stability of Bluetooth is also enhanced. It will automatically pair your phone in seconds. Bluetooth V5.0 earpiece ensures stable signal quality, and guarantees outstanding sound quality, bringing you high-quality audio experience. With high-quality speaker, brings you deep stereo bass sound quality. Designed according to the shape of the human ear canal and skin-friendly material, it perfectly presents a fashionable and appropriate shape, let you feel comfortable when enjoying music. Allows you to make a hands-free call, creating a clear communication with noise Isolating. Stable signal provides you a great experience when calling on the phone. More safer when driving. Built-in large capacity battery, the earbuds provide you up to 2-4 hours playing time with a simple charging and an additional 300mAh charging box. Enjoy your music all the day without worrying the battery running out. NOTE: Use steps and special instructions: (1) Turn on the charging box switch (blue or red light). (2) Open the top cover of the charging box and take out the earphones. (Important note: Turn on the charging box switch before opening the charging box, which is the premise of the headset automatically turning on) (3) Pair with other devices: Open the phone or other device Bluetooth settings - search for the Bluetooth name click to connect to Bluetooth, (4) The headset is placed in the charging box to enter the charging mode, and the headset is automatically turned off. (5) i11 Tws wireless headphones left and right headphones can be separately linked separately, other Bluetooth devices use. (6) i11 Tws wireless headset will automatically shut down if it is not connected to Bluetooth device for 5 minutes. Compatible with all ios device and Smartphone etc *****