The Life on Record NC400 Noise Cancelling On-Ear Headphones from TDK are designed to reduce ambient noise up to 85% while playing back audio from your portable music device. They feature a monitor button that disengages their noise cancelling technology, allowing you to hear the sounds of your environment. The NC400s have a lightweight, 442g foldable on-ear design for portability and can be transported with the included storage pouch. Their multi-directional ear cups allow you to adjust their positioning to provide added comfort during use. They additionally feature 40mm drivers and a 1.2-meter cable with gold-plated 1/8" connectors. Their active noise cancelling technology is powered by the included AAA battery.