Coltan is used primarily for the production of tantalum capacitors, used in many electronic devices. Coltan is important in the production of mobile phones; and tantalum capacitors that are used in almost every kind of electronic device. Niobium and tantalum have a wide range of uses, including refractive lenses for glasses, cameras, phones and printers. They are also used in semiconductor circuits, and capacitors for small electronic devices such as hearing aids, pacemakers, and MP3 players, as well as in computer hard drives, automobile electronics, and surface acoustic wave (SAW) filters for mobile phones.