Premium single-sided DECT wireless office headset: SD-Pro1 High Definition Voice Clarity with Ultra Noise Canceling Mic. Intuitive, pairs for desk sharing and phone conferences, mic mute and volume on headset. Full 8 hour TalkTime in Wideband and 12 hours in narrowband, Battery recharges 50% in 20 minutes. Long distance range of up to 180 feet and line of sight up to 590 ft.