The 12Vdc powered RLB1-SPDT relay board from Tactical Power Products is an individual dual buffered, Single Pole / Double Throw (SPDT) Relays. The relay features a dual transistor buffered inputs, triggered by a positive DC voltage over 5Vdc or by 0Vdc. (Inputs are provided for + or – trigger) An onboard LED illuminates when the relay is activated.