Ubiquiti UniFi AC HD is 802.11ac UAP device. It is 4x4 MU-MIMO 2,4GHz and 5GHz Acess point with modulation speed up to 1722+800Mbps supporting 802.11/a/b/g/n/ac/ac-wave2. This UAP is designed for example offices, hotels, warehouses and thanks to high performance is suitable for places with high quantity of connected devices. UAP-AC-HD has two antenas for 2,4GHz band (4dBi) and two antennas for 5GHz band (3dBi) for range up to 122 meters. It full supports roaming for transmission of associated clients between APs. Device features 1x USB 3C port and 2x Gbit LAN - one of them supports 48V (44 - 57V) POE (passive and active 802.3at)
Thanks to MU-MIMO (Multiple-User - Multiple-In - Multiple-Out) technology UAP AC-HD is able to communicate with several devices at the same time:
UniFi APs doesnt have own web GUI and you manage them via UniFi Network, which you can download on UBNT websites here: http://www.ubnt.com. Or you can manage UAP devices using UniFi Cloud Key which has UniFi Network preinstalled. Additional benefit is fact that UniFi Network software is free of costs and includes advanced functions without limitations.