QCY T4 true wireless mini invisible earbud in-ear headphones $ 28.13 Bluetooth version: V5.0 Compatible system: iOS / Android / Windows App support: version 5.1 and later on Android Communication distance: 10 meters (under barrier-free open environment) Use time: about 4 hours of talk; about 4.5 hours of music Support protocol: HFP/HSP/A2DP/AVRCP/AAC/SBC Charging bay capacity: 380mAh Charges in the charging bay: about 4 times for both ears Product accessories: earphones and charging box 3 pairs of ear caps (S, M, L) With earphones and ear caps Micro USB charging cable*1
