This model has Bluetooth 5.2, the fastest and most stable bluetooth signal transmission, distance up to 15 meters. Compatible with almost all smartphones, tablets, computers, etc. Built-in dual 57 mm large speaker units, 3D surround bass and stereo sound quality. TWS connection, support two speakers paired with each other to achieve surround stereo sound. Built-in 3000mAh large capacity lithium battery, ultra-long standby time and music playback time of about 5-8 hours. Built-in sensitive microphone that allows you to make phone calls through the speaker. Support playback from Micro SD card, playback from USB flash drive or via AUX line input using 3.5mm audio cable.