1. Description about the TWS surround sound technology of this product: The Bluetooth speaker uses the new TWS stereo technology, which allows you to pair two speakers and connect them to your phone simultaneously, thus getting truly enhanced 360° surround sound. 2. It is compatible with USB, TF card, Aux cable and has a built - in noise - reduction microphone, making calls clearer. TF/Aux 3.5Mm/USB flash drive functions - The speaker supports TF playback. The 3.5Mm Aux input allows you to connect to devices that do not support Bluetooth, such as computers. You can connect a USB flash drive to the speaker to listen to music. 3. Battery life: 10 hours. This Bluetooth speaker can be used for 10 hours after a full charge. Maximum sound level: 80 Db. It is equipped with a large dynamic coil speaker, with high, medium and low - tone types, capable of reproducing sound layers and providing stereo surround sound. It has a 57Mm speaker with a bass diaphragm. It has a cute and fashionable eggshell shape. 4. Bluetooth and hands - free phone functions - It can be connected to smartphones or tablets via Bluetooth within a maximum distance of 10 meters; with a built - in microphone for hands - free calls. It has four playback modes: Bluetooth 5.0, Aux/USB ports, and TF card.