Features: 1. The 40mm big speaker delivers real sound and makes your ears impressed 2. Bluetooth 5.0 technology, rhythm wireless, listen to good sound anytime, anywhere 3. Highly recognizable button control, one-handed operation, compact and light, easy to carry 4. Built-in lithium battery 5. With a 3.5mm audio cable, it can be used as a wired headset (when the 3.5mm audio cable is inserted, the Bluetooth is automatically turned off))