All electronics emit radiation in various quantities, which can be extremely harmful to the body and mind. Shungite is said to block EMF radiation and is extremely powerful for grounding. Place near electronic devices that you feel needs some extra protection. Some may contain small lines of pyrite inclusions.
Note that there are multiples of this product available and you may not receive one pictured. All items are similar, but may vary slightly in size, shape, and color. 
 
This is a natural product. Sometimes stones and crystals may have small imperfections and blemishes. These suggested uses do not replace medical advise. Please always consult your doctor for any health related issues.