Bluetooth 5.3, Quick ConnectionThe Rulefiss Q38 wireless earbuds uses Bluetooth 5.3 technology and dual-channel transmission, and supports protocols such as HSP, HFP, A2DP and AVRCP. Compared with Bluetooth 5.2, the transmission speed is +150%, the stability is +50%, 100ms low latency, and it is easily compatible with iOS/Android/Windows systems. After pairing the devices for the first time, the Bluetooth earbuds will automatically connect when you take them out of the charging case. 3D Stereo Sound, Crystal Clear CallsThe newest Q38 wireless headphones produce impressively beautiful sound, using an AAC/SBC audio decoder and a 14.2mm composite diaphragm to increase the audio frequency by 45% (20Hz-20kHz). Instrumental details are layered, vocals are clear, resonant bass and authentic highs ensure you feel pure music. At the same time, the Bluetooth headphones have built-in 2 clear microphones and CVC 8.0 noise reduction technology, they can retain 80% of the so