Amazon.com: Mikrotik SXT 6 2-Units Licensed 5.9-6.4GHz Frequency Equipped with RouterOS Level 4 License and 28 Degree Dual Chain 16dBi Antenna. Can be Used as Base Station or CPE : Electronics
rOSL6: RouterOS Level 6 Software License
Manual:License - MikroTik Wiki
MIKROTIK RouterBOARD (RB4011iGS+5HacQ2HnD-IN) (License level 5) - The source for WiFi products at best prices in Europe - wifi-stock.com
MIKROTIK RouterBOARD (RB2011UiAS-2HnD-IN) (License Level 5) - The source for WiFi products at best prices in Europe - wifi-stock.com
How to Enable Mikrotik licenses on Dedicated Server - Eldernode
MikroTik Licenses- MT/LVL4 licensing - Link Technologies, Inc.
Manual:Entering a RouterOS License key - MikroTik Wiki
MIKROTIK RouterBOARD (RB2011UiAS-IN) (RouterOS level 5) - The source for WiFi products at best prices in Europe - wifi-stock.com