XO BS28 air conduction sports bluetooth earphone

■Sound Channel System Dual Channel ■Control mode 3 physical buttons ■Active and passive: active ■Bluetooth solution BK3266 Bluetooth version: Bluetooth V5.0 Support Bluetooth protocol: A2DP v1.3, AVRCP v1.6, HFP v1.7, HID v1.1, AVCTP v1.4, AVDTP v1.3, and SPP v1.2 ■Bluetooth operating frequency: 2.4