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The world's first cell phone audio sensing technology 0.1s automatically capture the sound source amplification, goodbye to Bluetooth pairing anxiety Android/iOS/Tablet all universal Not picking the system 360° SOUNDFIELD SYSTEM Back Directional Sound Guide +Dual Graphene Diaphragms Increase sound pressure by 200% in the front and reduce sound leakage by 70% in the back. 20w 45mm 2x 5x Surging Giant Speaker Sound Quality Sound Low Frequency Enhancement Enhancement LARGE-CAPACITY LITHIUM BATTERY Built-in 1200mAh large-capacity lithium battery with long-lasting battery life, standby up to one week.