Here is an external microphone you can use with your smartphone to capture great audio to go with your videos. The Sennheiser Memory Mic allows you record up to 4 hours of audio and sync it all with one touch. Its Memory Mic app lets you manage recording easily.
The Memory Mic has an omnidirectional condenser capsule. It attaches to your clothes using its magnetic clip. What’s neat is you don’t need to maintain a Bluetooth connection to continue using this microphone from a distance.