The Rode VideoMic Me-L Directional Microphone is the right accessory for Vloggers. It attaches to the iOS devices with its Lightning connector. The cardioid polar pattern emphasizes the sound coming from the front while rejecting side noise. This Rode mic offers a frequency response of 20 Hz to 20 kHz to cover most of the audible sounds. With the SPL of 115 dB, you can record sounds from loud sources without noise. The rear 3.5mm TRS jack can be used for connecting a headphone to monitor the audio recording. Secure the mic to your iOS device with the included clip. Also, the provided furry windshield minimizes wind noise to maintain clarity.
The signal to noise ratio (SNR) is a useful and universal way of comparing the relative amounts of signal and noise for any electronic system; high ratios will have very little visible noise whereas the opposite is true for low ratios.