Fangrui Product Details 1. Zealot A2 Multifunctional Bass Wireless Bluetooth Speaker, Built-in Microphone, Support Bluetooth Call & Aux & Tf Card & Led Lights 2. Detachable Portable Shoulder Strap 3. The Mesh Cover Protects The Speaker From Water, Dust And Vibration 4. High Sound Quality Stereo, Support Tf Card Or Micro Sd Card 5. Call Function, Noise Cancellation Microphone, Let You Answer The Call Without Touching Your Phone 6. Led Light Function, Your Good Outdoor Helper 7. Specification: 8. Bluetooth Version: 5.0 9. Battery Capacity: 4000mah Lithium Battery 10. Speaker: 3w 11. Transmission Distance: About 10m 12. Frequency Response: 10hz-20khz 13. Signal To Noise Ratio: 85db 14. Working Voltage: 3.7v 15. Charging Voltage: Dc 5v 16. Charging Port: Micro Usb 17. Talking Time: About 10h 18. Music Playback: About 10h 19. Standby Time: About 90 Days 20. Charging Time: About 2.5h (different Charger Specifications Time Are Different) 21. Size: 168x52x52mm