Free yourself from limitations with the Sennheiser Flex 5000 Wireless Receiver. This advanced audio system gives you the ability to move as you listen no matter the source. Using Bluetooth, you connect your headset and get a range of up to 200 feet. In addition, the crystal clear audio is adjustable through three selectable hearing profiles. Each is designed to deliver only the best whether eait’s speech or music playback. In addition, the Flex 5000 Headphones have a Speech Intelligibility feature. With this, the built-in microphone automatically blocks environmental noise so everyone can hear you loud and clear. You have your choice of both digital and analog inputs so you can connect to a variety of devices with ease. Finally, the built-in battery gives you a whopping 12 hours of operation.