The AIR-CAP3702E-Z-K9 is a Cisco 802.11ac wireless access point that requires a wireless controller. It has 4x4 MIMO and 3 spatial streams to provide high bandwidth and coverage. It supports external antennas and has ports for power, Ethernet management, and additional modules. The document provides specifications on its frequency bands, data rates, memory, dimensions and environmental tolerances. It can be expanded with modules for wireless security, small cell functionality, or location services.