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Sam an adapter to put a camera mount on it - got the camera up pretty high - so high I couldn't reach it to turn it on and off!
I have a bluetooth remote button to start/stop video recording, to avoid having to touch my phone.
It was just a few dollars on ebay, and works with android and i-phone.
It can also be used to take photos remotely.
My newer Samsung phone, also has an 'S pen' stylus, which has a button which performs the same function.