Meet the Saramonic SmartMixer: a professional stereo microphone rig that lets you record studio quality audio for your smartphone. It has two 3.5 mm stereo mic inputs, one mini-XLR input, and a headphone monitoring jack. You also get a phantom power switch and an accessory shoe to mount video lights and other accessories.
The SmartMixer comes with two condenser microphones. You get the mounts and connectors needed to connect all your accessories and record like a pro. More information is available here.