On the right is a picture of an e-bow. This little device is used by many people to create a unique sound with your guitar and to mimic a stringed instrument that you would play with a bow. You hold the device just touching the strings and move it closer or further away from the pickups. It has a 9 volt battery in it and when turned on this creates an electro magnetic field which vibrates the strings like a bow and the result is a sustained sound. There are many strange and cool sounds you can make with this mimicking a cello or violin or similar instruments. It usually costs about £70 - 90 which is a fair bit but it is a great piece of gear and lots of fun.