GN NETCOM 925-15-508-185 Jabra Pro Landline Telephone Accessory 300ft Wireless Freedom - Get wireless mobility up to 100 meters/300 feet to fully control your Jabra hands-free solution with 2G4 technology 12-Hour Battery Life - A wireless audio device would not be a useful tool without an incredible battery life. Even with so much performance packed into such a small space, it still lasts up to 12 hours on a single charge HD Voice - High quality audio for crystal clear conversations Enjoy high-definition sound with HD Voice and get crystal clear, intelligible communication