Unified Communications Standard DECT Wireless HeadsetDECT Headset: * Monaural Ear (single ear) Headset* Busylight on headset* Leather Ear Cushions* Yealink Acoustic Shield TechnologyDECT Base:* UC Button* Input Ports: 2x Micro USB Port* 2.5mm jack port for Busylight BLT60(Optional)* Ringer* Power Adpater