Internal antenna model  (Must buy Controller for this model)
AIR-CAP2602I-N-K9
802.11n CAP w/CleanAir; 3x4:3SS; Mod; Int Ant; N Reg Domain
Acess Point 2600 series (802.11n)
Cisco Aironet 2600 Series is ideal for enterprise networks of any size that need high-performance, secure, and reliable Wi-Fi connectivity for consumer devices, high-performance laptops, and specialized industry equipment such as point-of-sale devices and wireless medical equipment
Enterprise-class silicon and optimized radios deliver a robust mobility experience that includes:
• 802.11n with 3x4 multiple-input multiple-output (MIMO) technology with three spatial streams, which sustains 450-Mbps rates over a greater range for more capacity and reliability than competing access points.
• Cisco ClientLink 2.0 technology to improve downlink performance and range for all mobile devices, including one-, two-, and three- spatial stream devices on 802.11n, while improving battery life on mobile devices such as smartphones and tablets.
• Cisco CleanAir technology, which provides proactive, high-speed spectrum intelligence to combat performance problems due to wireless interference for a self-healing, self-optimized network.