⭐️ Bluetooth version 5.3 ⭐️ Speaker: 10mm real copper ring ⭐️ Material: PC+ABS environmental protection material ⭐️ Listening time about 4 hours (80% volume) ⭐️ Talk time about 3 hours (80% volume) ⭐️ Continuous use: about 14 hours earphones ⭐️ Charging time: about 1.5 hours ⭐️ Standby time: 4 months ⭐️ Headphone battery: Lithium battery 25mAh (spray code 30mAh) plus protection board ⭐️ Charging case battery: 250mAh with protective plate