This is a single relay module for switching high voltage/current circuits.  This module is excellent for prototyping or permanent installations.  The relay on this module is controlled by 5V DC.  The contacts are rated for up to 15 Amps and 250V AC.  This module includes LED lights which illuminate to show the relay state.  The relay control leads include a common contact and both a normally open and a normally closed contact to accommodate any combination of circuit design.