Feature●【Mini Voice Amplifier】-- ①It is a Professional Voice Amplifier with 3 inches powerful magnetic loudspeaker. Compact size (4.9 x 1.9 x 3.6 inches) and light weight (0.56 lb.). ②The max 10 watts sound can cover about 10000 sq. ft (1000 ㎡) and ideal for a small or large group of 40-100 people. More advanced sound sensitivity and more sound penetration. The sound of microphone amplifier is clear, crisp, no noise and no distortion.●【Bluetooth Function Voice Speaker】-- Not only an voice amplifiers for teachers but also a portable Bluetooth speaker, you can connect to your mobile phone to listen to music, and you can also answer and reject calls.●【Small Size and Big Volume】-- ①It is a Professional Voice Amplifier with 3 inches powerful magnetic loudspeaker. Compact size (4.9 x 1.9 x 3.6 inches) and light weight (0.56 lb). ②The max 10 watts sound can cover about 10000 sq.ft (1000 ㎡). More advanced sound sensitivity and more sound penetration. The sound of microphone amplifier is clear, crisp, no noise and no distortion.●【Upgraded Microphone Speaker】-- ①This speaker amplifier can work as an MP3 audio player, can be used on computers and mobile phones. ②The mini teacher voice amplifier can repeat single tune, loop all music and switch songs. Supporting 3.5mm AUX audio input (Mic port can be used as AUX port), can work as a wired speaker.●【Warm Tips and Guarantee】-- ①12 Months Warranty and lifetime after-sales customer services make your purchase absolutely risk-free. ②Please charge the speaker before first time using, keep the speaker and mic for a distance to avoid the noise.Description Norwii 2000mAh wired voice amplifier and mini bluetooth 4000mAh voice amplifier speaker