All-In-One Voice Amplifier with Bluetooth Connectivity. The portable microphone with speaker produces a loud clean sound which is specially designed for outdoors. It is a portable WIRELESS voice amplifier for teachers, tour guides, coaches and more. WARM PROMPT: after received the product, please follow the steps below to set up the wireless voice amplifier. ( Please fully charge the microphone and speaker before use. ) 1. Turn on the speaker, short press the "M" Key to change into UHF mode. 2.Long press the "M" Key for about 3s with Prompt Tone "UHF waiting for connection". 3. Turn on the headset microphone and long press "+" till both devices complete pairing with a voice prompt "UHF is connected". And if you need to use the Bluetooth and mic at the same time. Please follow the below steps after you have successfully paired the mic. 3. Sort press the "M"key of the speaker, Prompt Tone "Bluetooth is waiting for connection" 4. Turn on the Bluetooth on your smartphone, the Bluetooth ID is "M800", and connecting it. Features: Loud and Clear: 18W output power, Sound covers 10000 sq.ft. Waterproof, shockproof and dustproof Bluetooth voice amplifiers are ideal for MEDIUM-SIZED or SMALL classrooms or outdoor activities. Portable &Compact Design: It comes with a wireless headset microphone & adjustable waistband belt which makes voice amplifier easy to carry. 3 in 1 Multifunctional: Portable Speaker and Microphone: Voice Amplifier + Bluetooth Speakers + Power Bank. Rechargeable Voice Amplifier: The portable speaker with built-in 4400mAh lithium battery offers you up to 8-12 hours of powerful amplification. Headset microphone lasts 2-4 hours. Package includes: 1*voice amplifier/ 1*wireless headset mic/ 1*waistband/ 2*charging cable/ 1*5V charger / 1*aux cable/ 1*manual