MP58 VoIP Teams & SIP (hybrid mode, limited SIP functionality) telephone, Android 9, 2 x Gigabit Ethernet, PoE required, AC optional, 7 inch touch colour LCD, optimal HD audio with Yealink Noise Proof Technology, supports Microsoft / Yealink / Unify Square device management platforms, RJ9 headset jack, 2 x USB, Bluetooth 4.2, 802.11ac Wi-Fi, add up to 3 expansion modules (sidecar / attendant console) SKU #EXP50 (MP58 Teams firmware 122.15.0.27 or higher required), optional AC power supply, SKU #PS5V2000US, optional Bluetooth handset, SKU #BTH58. Special Order, No returns or cancellations. Note: For more information on the limited SIP functionality, please download the MP58 User Guide (pages 56-62), which can be found on the Yealink web site, http://support.yealink.com/documentFront/forwardToDocumentDetailPage?documentId=343.