Portable Microphone Loudspeaker Voice Amplifier Recorder Mic Speaker Audio Mini Wired Mikrofon Surround Sound Player For Teacher Specifications: Number of speakers: 2 Output power: 8w Battery capacity: 2200mAh Signal to noise ratio: 75dB Frequency response ran: 100HZ-20KHZ Channel: Mono Effective distance: 15 meters Packaging list: 1 * Speaker 1 * Microphone 1 * Charging cable 1 * Hanging rope Related Products:wireless microphone,bluetooth microphone,bluetooth speaker with microphone,voice amplifier,speaker with microphone,portable microphone,microphone with speaker,microphone for speaker,microphone headset,headset microphone,microphone speaker,portable speaker with microphone,speaker and microphone,bluetooth microphone for speaker,microphone and speaker 1. Adopting 80mm lar diameter composite high pitched crystal magnetic horn, equipped with carbon atom lattice graphene diaphragm, it greatly restores the real human voice 2. Equipped with IC/CVC dual technology, the three tone ratio is adjusted by acoustic experts combined with frequency shift principle, significantly reducing the howling frequency 3. Long lasting battery life, calculated based on the teacher's usa frequency of 2 classes per day, it can be used for about 2 weeks when fully chard under normal circumstances 4. Insert a memory card/USB drive to start looping playback of lesson preparation recordings, making it easier to use 5. Suitable for teaching, tour guides, promotions, gatherings, etc