Precautions:
The microphone does not use headphones/earphone with wheat, because the headphones/earphone and microhone would conflict with wheat arising from noise!
Do not charge the phone when use of a microphone, otherwise there will be current sound!
f the recorded songs sound small, or there is a slight squeak, because the cable is not connedted good reason, according to the above method of inspection control, re-connection

Apps Recommended for Karaoke :
Sing! Karaoke by Smule, 欢唱, 酷我K歌….
the different between using Android phone and IOS phone.
for Android : the voice will record by apps, and you can heard your voice when you replay it.
for IOS : you can heard your voice on the spot.