MP54 VoIP Skype for Business (SfB) telephone, Android 9, 2 x Gigabit Ethernet, PoE required, AC optional (SKU #PS5V2000US), 4 inch touch LCD, Yealink Noise Proof Technology, supports Microsoft / Yealink / Unify Square device management platforms, RJ9 headset jack, USB, optional USB Bluetooth adapter (SKU #BT41), optional USB Wi-Fi adapter (SKU #WF50). Special Order, No returns or cancellations.