This product is either discontinued or we cannot get that from suppliers.
Asus USB-AC56, Network IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.11ac, Port USB 3.0 x 1, Internal 2 dBi PCB antenna x 2, External dipole antenna x 1, Frequency 2.4 GHz / 5 GHz, ASUS USB-AC56 Utility.
The ASUS USB-AC56 is a dual-band 802.11ac Wi-Fi adapter with a USB 3.0 connection that brings high-performance wireless networking support to desktop and notebook PCs.