Features 1. power bank for charging phone 2. two connection methods: single/double free to use, single ear listening to enjoy alone, listening to hifi stereo in both ears. 3. wireless bluetooth headset: 8d surround hifi sound effects; graphene diaphragm; 5.0 low power consumption; large capacity; true wireless bluetooth headset. 4. function: answer and hang up the phone; play/pause operation; volume adjustment; previous and next song switching; siri voice wake up (multi-function button). 5. 5.0 automatic power-on pairing: built-in cvc8.0 intelligent noise reduction; hd call. 5.0 bluetooth game without delay, the electric cabin can be used as a mobile phone bracket mobile phone emergency power supply, multi-function use. 6. sweat-proof earphones: water-resistant nano-coating efficiently protects sport headphones from sweat