Polycom VVX D60 Base Station with Wireless Handset - 2200-17823-001- 4 Line PoE - Includes AC Adapter Wireless Handset - Up To 165' Indoor / 980' Outdoor Range Session Description Protocol (SDP) / Supports 4 Simultaneous Calls Acoustic Echo Cancellation / 2" TFT 178x220 Color LCD / Up To 10 Hours Talk Time PoE & AC (Adapter Included) Accessory Handset Compatible with: VVX 300, 301, 310, 311, 400. 401. 410. 411. 500. 501. 600 & 601.