The Plantronics CS520 wireless office headset system is designed for call center agents, customer service reps and office workers who need to reduce unwanted background noise. With 2 speakers to cover both ears and a noise canceling microphone, you'll be able to hear and be heard crystal clear without the background distractions. In addition, the Plantronics CS520 is compatible with 98% of corded desk phones on the market. Also, a wireless range rated up to 350 feet and a battery rated up to 10 hours, you'll be able to keep the conversation going on your Plantronics CS520 without worrying about a dead battery. Lastly, you're covered with a 1 year advanced replacement warranty for peace of mind.