transmitter

I’ve got the Roger Pen which I use regularly throughout the day. Just today I streamed from it from 9.30am to 8.15pm. I use it a lot. What I want to know is, is it best for me to use up the battery completely and then charge it or to charge it when you get the first low battery warning?! I...

I'm looking for a high-quality microphone transmitter that a lecturer can wear unobtrusively like a lapel mic or an earpiece boom mic that leaves the ear cavity open and unobstructed. The mic will need to connect wirelessly to my iPhone 6s via Bluetooth. The transmitter to receiver technology...