Main-secondary switching. Pop-up window. Tap function. Intelligent Induction. Active noise cancellation. HI-FI clear voice. Silicon case and lanyard. Standard: GB/T14471-2013 Earphone: Fit in ear Specification: Lightning Wireless connection version: 5.2 Wireless transmission Distance:≥10 m Transmission frequency: 2.4GHz-2.48GHz Battery capacity: 33mAh Standby time: 180hrs Charging case battery capacity: 250mAh Music time: About 6hrs Talking time: About 5hrs USB charging: About 2hrs