This product is either discontinued or we cannot get that from suppliers.
The HP M220 802.11n Access Point Series is optimal for sites requiring more extensive wireless LAN coverage, supporting standalone operation or "clustering" of up to 16 M220 Acess Pointss. These dual-band, single-radio devices support high-speed wireless networking at 5GHz or 2.4GHz, combined with advanced features such as business-class security and uninterrupted wireless client roaming for a better user experience.