Professional DECT wireless mono headset designed for the Mitel MiVoice 6900 IP phone series (compatible with the 6930w and 6940w). Provides a range of up to 300 feet / 100 meters, noise-cancelling microphone, HD Voice wideband audio, up to 8 hours of continuous talk time and at least 36 hours of standby. Powered directly from the phone via the extension/sidecar port (no separate DECT power supply required during normal use). Includes remote headset control for answer/end, volume, and mute.