Portable Bluetooth Speakers,IPX7 Waterproof Wireless Speaker with 24W Loud Stereo Sound,Deep Bass,Bluetooth 5.0,Dual Pairing,30H Playtime for Home,Outdoor,Party 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 30 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 x 8.5 x 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