I've had this little electric generator for over two years now and it works great. LEARN: It doubles the volume of your voice when you speak. If you are a teacher and want to keep your voice then this is for you. PERFORMANCE: I even use it - with a few others - in my vocal a cappella group. When we walk in the street and sing (e.g. Christmas carols) we can be heard 50 feet away. It adds high frequencies to the voice that can still be heard live. You singers know what I'm talking about. OPENING HOURS: I don't know! He never died for me! It still works after 2-3 hours of talking/singing. DURABILITY: I dropped it once and thought it was over for the device. But. To my surprise everything was fine. Take this little guy if it fits your specific needs as a teacher or performer.
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