Non-in-ear earphones: Lightweight, compact and comfortable to wear, with an ear-hanging design for a secure fit Stable wearing: Equipped with sports anti-skid pads, the headphones will not fall off even during intense sports, fearless high-intensity exercise Bluetooth V5.3: The newly upgraded Bluetooth V5.3 chip brings a more stable, smoother, and faster transmission experience HD HIFI Stereo Sound: HD call and offers low, powerful bass, clear midrange and loud treble sound HD calls: Dual microphone ENC noise reduction, accurately picks up the human voice while dampening ambient noise Specifications: Bluetooth chip: BLUETRUM AB5636E Bluetooth version: Bluetooth V5.3 Bluetooth protocol: a2dp\avctp\avdtp\avrcp\hfp\spp\smp\att\gapga tt\rfcomm\sdp\ Transmission distance: straight line ≥ 10 meters Battery capacity (charging case): 400mAh Battery capacity (single earphone): 100mAh Music playback time: about 48 hours Talk time: about 12 hours Charging time: about 1.5 hours Charging interface: Type-C, DC5V 400mA Speaker: 16mm, 32Ω speaker Waterproof level: IPX4