Microsoft Certified Teams Standard DECT Wireless Headset. DECT Headset:, Monaural Ear (single ear) over-the-head Headset, Busylight on headset, Leather Ear Cushions, Yealink Acoustic Shield Technology DECT Base:, Microsoft Teams button, Input Ports: 2x Micro USB Port, 2.5mm jack port for Busylight BLT60(Optional), Ringer, Power Adpater