Chorus Design??Double Q900 microphones(ONLY Q900) can be connected with bluetooth?? so as to realize the dual microphone chorus. And 4 in 1 system with speaker & Mic & Amplifier &player for iOS devices & Android devices. 2200mAh Built-in Rechargeable Battery? for up to 4 -5 hours of speaking?? singing ??recording or playing Music. 5 W*2 Speaker& Amplifier. louder and stronger sound than other similar sellers.</br>??Enhanced Clarity??Each Bluetooth wireless microphone features three times the noise reduction for crystal clear voice clarity while speaking?? singing or presenting.</br>??Reduced Pop??- Ideal for karaoke singing?? instrument recording?? podcasting or live interviews?? the built-in pop filter helps reduce "p sounds; More stunning Karaoke live-sound and more clear music rhythm with echo reverberation.</br>??Support TF Card?? Support micro TF card max 64GB(NOT INCLUDE) and song switch. You can play music and sing without smartphone</br>??Wireless Connection & Cable Connection??You can connect with your phone with cable or Bluetooth. And turn on the singing software on your phone or on your computer. With 3.5mm audio jack?? it is compatible with Android?? iOS phone?? etc. In this way?? you can hear your voice will come from the speaker.</br></br>Product Description</br></br