For the small office and home office, the S12 is stylishly designed for easy use with a choice of headset wearing styles. The headset can be worn over the head for stability or over the ear for convenience. The headset also features Firefly, the in-use indicator light that lets others know you’re on the phone. Improve your productivity - filing, using e-mail, taking notes while on the phone. Keep your hands free to multitask. The Noise-Canceling Microphone delivers crystal clear voice quality and eliminates annoying background noise. Call Clarity Technology filters phone line and room noise for clearer calls. With the Firefly In-Use Indicator Light, there's no more unintended interruptions, thanks to this unique boom-mounted flashing red light that lets others know you’re on the phone. The 2-in-1 Convertible Headset provides all-day comfort with the style that works best for you: over the head for stability or over the ear for convenience. This system's easy installation lets you connect to single- or multi-line phones.