![UTC™ ATS1820 Relay Expansion Module [ATS1820]](http://en-shop.sysaway.com/cdn/shop/products/ATS1820_grande.png?v=1660906238)
Reference:
ATS1820
Expandable board of 16 open collector outputs for ATS centrals and ATS1201E expander module and ATS1250 door controllers module. Security grade 3 certified
