1) Voice amplifier WB002 adopts high-quality speaker and focuses on sound reinforcement to make its sound more clear and louder. 15W powerful output could cover 10000 sq. ft, kindly recommend use this portable headset microphone speaker system indoors like classroom, it's plenty loud for a class of around 50 middle schoolers to hear you.

2) Wireless voice ampliifer unit is very easy to pair with bluetooth headset microphone, just turn them on and they will be paired automatically. Operation is straight forward, even if you could without needing the manual Everybody can very quickly up and running.

3) Portable voice amplifier built in 2600mAh rechargeable battery that could get up to 9 hours of voice amplification on one charge, perfect for teachers and presenters. wireless microphone headset support 8 to 10 hours. Both them are be charged quickly with the included Type-C charger.

4) Bluetooth voice amplifier is lightweight to wear, it can be clipped to a belt or hung around the neck using the supplied neck strap. The bluetooth headset is lightweight and doesn't slide off head. Good think that wireless microphones come in two parts, it can also be used as handheld mic if anyone wants to use it that way. The headset comes apart very easily for storage.

5) A new-school but affordable personal amplifier/speaker, complete with a little combined bluetooth earpiece/mic, a belt clip, a lanyard and a type-c charger, manual. WinBridge provide two years warranty and 30-days return without any reason.