Featuring noise and echo cancellation technologies and an ergonomic design for optimum comfort, the Kinivo BTM440 is the perfect choice for those who spend long hours needing their ears plugged. Bluetooth capable, they work with just about any gadget, sport a rechargeable lithium-ion battery good for 4.5 hours (150 hours in stand-by) and easy-to-use controls for seamless switching between calls and music.