The EAP1750H and the ECB1750 are 802.11ac Wave 1 devices.

Below are EnGenius models with 802.11 AC Wave 2 Wireless
Standards: 

• Managed Indoor Models
• EWS371AP
• EWS370AP
• Managed Outdoor Models
• EWS871AP
• EWS870AP
• Electron Outdoor Models
• ENS620EXT