Wireless over-the-head monaural headset connects to both your computer (USB cable included) and your corded office desk phone (modular plug). Noise-canceling microphone makes it ideal for noisy office or call center environments. You will enjoy DECT 6.0 frequency (1.9GHz) for crisp, clear, interference-free, secure calls. Extra-long 350' range allows maximum freedom and productivity. Lightweight design provides all-day comfort. Fully charged battery provides 9 hours of continuous talk time. You can pair four headsets with one base for easy conferencing functionality. Headset is compatible with virtually any corded desk phone.