The Philips In-ear Noise Cancelling Headphones SHN7500 are designed for people who want to enjoy listening to their music without any background noise or distraction. The control device on the end of the neck strap can be turned on to reduce unwanted ambient noise by 80%. This product is mainly used to block out the ambient engine noise of planes, trains and buses which makes these headphones ideal for travelers. The soft cloth neck strap is comfortably worn around the neck with the control device hanging over the chest for easy access to the power and volume controls. It operates on one AAA battery inserted into the control device.