Sennheiser Lavalier microphone for IOS. This should be in your toolbox!
A professional Mobile mic recording package that includes a Sennheiser ME 2 omni capsule, Apogee 24 bit/96 kHz digital connection to iPhone, iPad or iPod touch, and an Apple Mfi certified Lightning connector
Also, Apogee MetaRecorder can be controlled from an Apple Watch – start and stop recording, add a take to Favorites, add Markers or set your microphone input level.
iOS version: 8.0 and later
iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPad Air 2, iPad Air, iPad (4th generation), iPad mini 3, iPad mini 2, iPad mini, iPod touch (5th generation)