1. BT 5.3 TRUE STEREO BT 5.3 chip, built-in performance decoding module, high-performance stereo, stable signal without lag, smooth listening to music without delay. 2. POWER-OFF MEMORY PLAY FUNCTION Memorize frequency, song name and volume. Power off and then restart, it will play fromtheplaying song when power off. 3. QC 3.0 +PD20W FAST CHARGE Support multiple devices to charge at the same time, intelligent shunt, charging winot hurt the phone 4. COMPATIBLE WITH 99%DIGITAL DEVICES Intelligently identifies various types of mobile phones, tablets, MP3players, navigation and other terminal electronic products, automatically matches the voltage, and chargesat the same time, which is also safe