VXi 203502 CC Pro 4010V DC Over-the-Head Monaural Headset with DC N/C Microphone Advanced noise canceling microphone improves communication by cutting nearly 90 percent of background noise. Wideband audio (HD Voice) provides clearer conversations and greater productivity. Hearing protection suppresses sudden and unexpected sound spikes. High quality durability stands up to all-day, every-day use. Requires V-type QD lower cord (available separately) to connect to your phone.