One 13 watt CFL two-pin lamp with MAGNETIC ballast inside the adapter. Lamp & adapter are included, both are used.

Sylvania DULUX CF13DS/841/ECO 4100°K lamp, as pictured. Total length with lamp installed is about 24cm or just under 10".

This adapter will light a CFL with a glow-bottle in its base. See lamp types (not included) in the last pic.