Finder 55 Miniature General Purpose Plug-In Relay is available with lockable test button and mechanical indicator. The contact is made of silver nickel. Features lockable test button/mechanical flag indicator as standard on 2/4-pole types, coil indication/EMC suppression modules, 99 series timer module 86.30 options. · · · Cadmium free silver nickel contact · · Integral LED and coil suppression options · · Optional alternative mounting adaptors · · UL listing (certain relay/socket combinations) · · European patent · · The box has a clear cover, so you can easily see the contents of the box.