The BT-500ANC Over Ear Active Noise Cancelling Headphones are great everyday wireless headphones for use at home, at work, or while traveling. Featuring a foldable, extremely portable design, 40mm drivers, and active noise cancelling technology, the BT-500ANC utilizes Bluetooth® wireless technology to connect with your mobile device at distances up to 32 feet away. They feature the Qualcomm® aptX™ HD audio codec for crystal clear, CD quality sound. Experience exceptional sound quality, comfort, and design with the Monoprice BT-500ANC Over Ear Active Noise Cancelling Headphones!