Fangrui Product Details 1. Zxl-h3 Portable Teaching Microphone Amplifier With Time Display, Spec: Wired Version (white) 2. Material: Abs, Electronic Components 3. Function: Insert Card, Radio, Voice Prompt, Call Function 4. Channel: 2.1 5. Number Of Speakers: 1 6. Bluetooth Protocol (wireless Model): 5.1 7. Effective Distance: 10 Meters 8. Operation Mode: Button 9. Play Format: Mp3, Wma, Wav, Ape 10. Support Format: Tf Card 11. Frequency Response: 90hz-12 Khz 12. Signal To Noise Ratio: 65db 13. Loudspeaker Resistance Group: 2 Ohms 14. Output Power: 8w 15. Built-in Battery: 4500mah Lithium Battery 3.7v 16. Charging Voltage: Dc 5v 17. Charging Time: 1-2 Hours 18. Use Time: About 15 Hours 19. Transmitter Battery (wireless Model): Button Battery (delivered With Battery) 20. Multifunctional Loudspeaker, Digital Clock Design, Can Also Be Used As An Alarm Clock 21. Two Styles, Two Ways Of Use, You Can Choose Freely 22. The Smart Display Shows The Remaining Battery Power And The Working Status Is Clear At A Glance 23. Dimensions: 7.5 X 11.5 X 3.1 Cm 24. Product Weight: About 230 Grams