Lumen by Clement Di Natale

No apps. Borrowed iphone - and you're able to turn the torch on, off, up or down... While they're holding it.

✅ Anyone can do this. 
✅ No remotes or magic apps. 
✅ Ends clean. 
✅ Works on iPhones only. Sorry Android.
✅ Instant tutorial. You can learn this immediately after purchasing.