T&G TG-671 Portable Wireless 3D Stereo Subwoofer Speaker with FM/USB/LED(Blue)1. Bluetooth specification: V5. 3 2. Output Power: 5W 3. Frequency Range: 100HZ 18KHZ 4. Battery capacity: 1200mAh 5. Playback time: 2H 6. Battery voltage: 3. 7V 7. Adopting advanced Bluetooth audio decoding chips, supporting the connection of all Bluetooth devices; 8. LED lights with multiple flashing modes, which can flash with the music melody and switch with one click; 9. Mesh cover to prevent water, dust, and vibration from entering the speaker;