The AT&T Wireless Wi-Fi Hotspot Modem is a black device that supports LTE cellular network technology. It measures 2.6 inches in height, 0.6 inches in length, and 4.4 inches in width. It can connect wirelessly through 4G, 3G, Wireless (Wi-Fi), and Wireless-Wi-Fi 802.11g. It is designed to fit a PC and is carrier-locked to AT&T.