Product details of WIWU Airbuds Pro 2 SE Bluetooth 5.4 Wireless Bluetooth Earphones Main-secondary switching. Tap function. Intelligent Induction. HIFI clear voice. Silicon case and lanyard. Standard: GB/T14471-2013. Earphone: Fit in the ear. Specification: Lightning. Wireless connection version: 5.4. Wireless transmission Distance:≥15 m. Transmission frequency: 2.4GHz-2.48GHz. Battery capacity: 30mAh. Standby time: 180hrs. Charging case battery capacity: 300mAh. Music time: About 4hrs. Talking time: About 3.5 hours. USB charging: About 2hrs. Chips: JL6973/ BT5.0 Battery: 300mAh for charging case, 30mAh for earbuds Charging time: 2 H Working time: around 4H Main-secondary switching Intelligent Induction HIFI clear voice Pop-up window and tap function.