Intelligent Bluetooth Speaker Bluetooth Small Speakerhigh Sound Quality High Volume Car Mounted Household Card Insertion Subwoofer Features: 360 ° panoramic sound effect with unimaginable high pitched, pleasant mid-range, and bass Bluetooth 5.0 Speed Stable Memory Pairing Distance is Longer, Transmission is More Stable, Intelligent and Quick Connection Intelligent voice calling, voice song ordering, high-definition call intelligent noise cancelling microphone, filtering environmental noise, High capacity battery music car with long-lasting new upgrade, low power consumption, large capacity lithium battery, long-lasting of 20 hours, ensuring uninterrupted music 6 modes for playing, switching between intelligent conversations, wireless Bluetooth, card/USB playback High volume payment announcement, real-time voice without delay, supports payment voice announcement, don't every payment Product Description: size:13*8.5*6CM Bluetooth version: 5.0 Bluetooth receiving distance: 10 meters Pronunciation unit: tweeter+double bass diaphragm Battery: 2000mA Product material: ABS+iron mesh Product size: 13 * 8.5 * 6CM Playback mode: Bluetooth/frequency cable/USB drive/memory card/microphone/radio Packaging: Subwoofer * 1 Data cable * 1 Connection Bluetooth connection | Card | USB Frequency response range 100HZ-20KHZ Signal-to-noise ≥75dB Number of speakers: 1 Effective distance 10 meters Box plastic Power mode USB grade IPX 2 Bluetooth version 5.1 Built-in battery capacity 2000mAh-4000mAh (inclusive) Rated power 5 Rated voltage 3.7 technology ABS+metal mesh Is there a built-in battery? Built-in battery