All-In-One Portable Voice Amplifier with Bluetooth Connectivity. The M800 seamlessly combines a powerful 18 watts speaker with a wired headset microphone into one small portable PA system. The waistband voice amplifier has built-in a long-life high-capacity rechargeable battery and produces a loud clean sound. It is a portable voice amplifier for teachers, tour guides, coaches and more. Features: 1. This is a 3 in 1 personal voice amplifier, waterproof bluetooth speaker, portable power bank. 2. A portable plug-in microphone, very easy to setup and use. 3. Small voice amplifier with 18 Watts output amplifies your voice and saves your throat. The sound covers over 10,000 square feet which is clear, crisp and no distortion. ( Can be used for group of 20 to 250 people.) 4. voice amplifier is shockproof, splashproof and dustproof. But cannot be partially or fully submerged. 5. It is a great bluetooth voice amplifier. You can play the music though the USB PORT; TF CARD; AUX INPUT (e.g. mp3, CD player); or STREAM the music from your Bluetooth-enabled devices like Phone,Tablet and more. 6. USB power bank to conveniently recharge your smartphone, tablet, and more. 7. The personal microphone is rechargeable and can be used for 8 to 12 hours (MIC mode), 6 to 8 hours (musical mode) with a fully charged battery. 8. Easy To Go -- Compact size 4.57"(Height) *3.66" (Width) * 1.65" (Thickness) and light weight (0.86 lb). Pacakge includes: 1*voice amplifier/ 1*headset microphone/ 1*waistband/ 1*charging cable/ 1*5V charger / 1*audio cable/ 1*manual. Noted: 1. Only the amplifier speaker comes with built-in Bluetooth capability. The Wired Headset is not a Bluetooth mic. 2. Waistband voice amp doesn't inlcude TF card or USB drive; 3. The item CAN NOT be soaked in water and the microphone is not waterproof !