The wide-angle lens is great when you need extra field of view, approximately increasing 45% FOV compared with the normal smart phone.
Macro lens
The macro lens applies roughly a 10x multiplier and allows you to focus the smart phone within 12-15mm of the object.
Circular polarizer filter lens
The CPL is designed to reduce glare from reflected surfaces and show colors more true to life. When rotated, the lens blocks certain wavelengths of light from entering the camera lens and hitting the camera’s sensor.