The Yealink W90 DECT IP Multi-Cell System, consisting of three elements - a Virtual Integrator Manager (optional), a DECT Manager W90DM and a base station W90B, is designed to provide the organizations who require wireless coverage with the full ease of deployment. This DECT multi-cell system intends to create an extremely scalable and reliable solution for the organizations of any size and any shape. The VIM system supports up to 10 DM, 600 base stations, 2500 handsets and 2500 simultaneous calls, the W90 multicell system supports up to 1 DM, 60 base stations, 250 handsets and 250 simultaneous calls, which ensures one call in each handset, and allows you to get rid of the limited wireless signal coverage of only one base station. Meanwhile, the system can work with Yealink W53H, W56H, W59R, W73H, CP930W, and DD Phone (T54W DD Phone is not applicable to VIM system) with seamless roaming and handover of the calls, making freely mobile communication in and between each zone achievable. Both W90B and W90DM join the modern, compact design with Yealink HD voice quality, that setting free your ears and giving you an elaborate audio experience. This SKU is W90 Base Station only. Please check on IPY-W90B-DM for W90B + W90DM kit