T&G TG417 40W Portable Outdoor Bass Dual Microphone Wireless Bluetooth Speaker 1. Wireless specification: V5.3 2. Support wireless protocols: L2CAPA2DPAVRCPHSPHFP 3. Transmission range: 10m 4. Audio signal-to-noise ratio: greater than or equal to 90db 5. Battery capacity: 4500mAh 6. Built-in voltage: 7.4V 7. Normal volume playback: about 4h 8. Speaker specifications: 78mmx2 9. Charging voltage: 5V2A 10. Charging time: about 4h 11. Adopt advanced wireless audio decoding chip, support wireless device connection 12. The sound is soft, clear and dynamic, with distinct levels 13. Direct reading of TF card and U disk, support Line in audio input 14. No connection in wireless mode, shut down in half an hour 15. Multiple flashing modes of colorful LED lights, the light can flash with the music melody and switch with one key, the music melody can not only be heard but also seen 16. Support dual wireless microphone connection, support two outdoor EQ audio modes