Recording Function: BT music recording speaker, while watching video, you can record sound and save it to U disk or Memory Card (card not included). Easy To Use: Sound recorded in the speaker can be saved locally, enjoyed directly locally, or shared with friends, suitable for various scenarios. Sound Format: Wireless speaker records the BT sound or line input sound as an mp3 file and saves it in the card. Support mp3, ape, flac, wav, wma playback. Multi Input: Speaker can play BT music through BT, or line input sound, and can also play music in U disk or Memory Card to meet your different needs. Long Battery Life: BT speaker has built in 1200mAh battery, can be charged for about 2 hours alone, and record about 5 hours after full power (related to the playback volume).