Bluetooth 5.0: With bluetooth, you could keep away from cables, it could reduce the power consumption. This device can pair with Bluetooth headphones or speakers, cannot pair with phones or computers. Adjustable Memory: 32GB memory card is installed in the card slot, you can also expand memory according to your need by inserting a larger capacity memory card, maximum support up to 128GB. Long Standby Time: 3 hours of music playback time in Bluetooth headset , 12 hours of music playback time in normal headset. Lightweight , mp3 can be put into the pocket , you could listen to music at anytime and anywhere. Multi-function: Support Bluetooth, music ,Video, FM radio, Record, photo viewer, E-book reader, voice recorder, video(need conversation tool to convert) , Clock. Perfect Sound Quality:You could listen to music while exercising, support most audio formats, perfect sound makes it an essential device for enthusiastic listeners, meet the requirement of your life.