I am a college professor and bought this device to use for hybrid scaling/personal study. That *should* work just fine. It was fully charged. I used my iPad to film and this mic to connect to my iPad so I could move around the class as needed. Unfortunately, he kept texting me. I was talking from 30 seconds to 5 minutes and everything worked fine and then suddenly turned off. So I played around with the microphone for most of the lesson. This thing is similar to a lot of things in Revain - a great idea, but in practice it's not perfect. Revain should not sell such untested, unreliable products, especially at such a high price. I returned it for a refund after a bad lesson.