ZEALOT S51 Portable Stereo Bluetooth Speaker with Built-in Mic, Support Hands-Free Call & TF Card & AUX(Blue)

1. Portable lanyard, easy to carry 2.52mm double magnetic loudspeaker, can be connected by TWS, stereo surround 3. Support TF card and U disk playback, can also be used without Bluetooth 4. Built-in sensitive microphone, smart and clear call 5. AUX audio input, easy wired connection 6. Concave bottom round button, anti-slip and sensitive specification: 1. Bluetooth version: V5.0 2. Speaker: 5W x2 3. Transmission distance: about 10m 4. Frequency response: 100Hz-20KHz 5. Signal to noise ratio: 90dB 6. Working voltage: 3.7V 7. Charging voltage: DC5V 8. Charging port: Micro USB 9. Battery capacity: 1800mAh 10. Talk time: about 3h 11. Music playback: about 3.5h 12. Standby time: about 30 days 13. Charging time: about 2.5h (different charger specifications time are different) 14.USB input: 5V 1A 15. Size: 80x80x192mm