Cordless Bluetooth (4.2+Edr) Anc Headphones. Anc Stands for Active Noise Cancelling. These Robust Yet Light-Weight Anc Headphones Cancel Disturbing Ambient Sounds to Make the Music Sound Even More Clear Transparent & Powerful, But Are Also Ideal for Optimal Concentration. Especially Useful in a Busy Office or While Travelling. the Headphones with Oval Ear Cup Have Soft Ear Cushions That Completely Close Off the Ears, an Adjustable Head Band, a Control Panel on the Ear Cup & a Microphone Function for Answering Phone Calls. Range Up to 10 Meters. the Powerful 3.7V Lithium Battery is Good for Playing Time of Up to Approx. 8 Hours. Anc Grade 18-20 Db. Comes with an Attractive Pouch. Includes Li-Ion Battery, Micro-Usb Charger Cable & User Manual. Each Piece in a Box. Minimum Quantities Apply.