SonicProtect for TZ200 FAMILY (TZ270, TZ270W) for 5 Years Equivalent of AGSS.
This is a subscription, and the licence extends your current TZ270 or TZ270 Wireless-AC appliance so you can later purchase one of the SonicWall TZ200 Family (next-gen - possibly called the TZ280?) via the Secure Upgrade (Appliance Only) with no Attached Subscription (Existing SonicWall Customers Only).
The TZ270 and TZ270 Wireless-AC are still current models.
More information: SonicProtect Subscription | SonicWall