ROLTON K400 Mini Voice Amplifier Megaphone Loudspeaker MP3 Player Teacher Mic Speaker - Black

• Voice Amplifier: Amplifies your voice and saves your throat when you have a difficult time speaking loudly enough
• Rechargeable Voice Amplifier: A 1200mAh battery plays hours of playtime
• Portable: Voice Amplifier this microphone and speaker set is a portable public address system. You can take it to multiple locations, such as classrooms, bingo calling and outdoors
• Music Playing: TF card playing & USB flash drive playing. You can repeat a single tune, loop all the music and switch songs

Specification:

• Type: Mini Speaker
• Material: ABS
• Power: 5W
• Input: DC 5.0V
• Signal-to-noise ratio: 83dB
• Impedance: 2?
• Speaker: 2.5 inch X1
• Voltage: DC 3.7V
• Capacity: 1200mAh
• Audio format: MP3/WAV
• Dimensions: 85x85x34mm
• Separation: 80dB
• Distortion: 1% (3.7V, 1Khz, 1W)
• Play: U disk and TF card
• Charging: Standard USB 5V
• Suitable for: Education, tour guides, promotions, conferences