Features:  - 360º cinema surround subwoofer effect.  - Support Bluetooth + wired mode.  - 4 speaker unit  - HiFi sound effect.  - 4D surround sound.  - 1200mA large capacity battery.  - DSP noise reduction.  - Support card speaker/FM radio/Bluetooth/AUX mode.    Specifications:  Type: wireless speaker, Bluetooth speaker, card speaker, smartphone speaker, sound bar;  Connection method: Bluetooth connection;  Interface type: USB;  Frequency response range: 80HZ-180KHZ;  Output power: 4w;  Signal to noise ratio: ≥80dB;  Power supply: built-in lithium battery;  Battery capacity: 1200mA;  Continuous working time: 10h;  Channel: 2+2 stereo + resonance sound cavity;  Extended storage: 32GB;  Bluetooth: Bluetooth 5.0;  Number of speakers: 4;  Effective distance: 10 meters;  Function: card speaker, radio, voice prompt, call function, AUX cable;  Operation mode: key;  Applicable people: General;  Display: none;  Play format: MP3, WMA, WAV, FLC, APE;  APP: Support;  Supported format: U disk;  Speaker adjustment method: button;  FM Radio: Support;  Shell material: plastic + metal;  Color: Black / Grey;  Product size: 38.1*6.5*5.6cm;  Product weight: 607g;    Package Included:  1 * Bluetooth speaker;  1 * AUX audio cable;  1 * USB charging cable;  1 * warranty Card;  1 * user manual