ELECTRONICS-SALON Panel Mount Momentary-Switch/Pulse-Signal Control Latching DPDT Relay Module,12V This item has been assembled, and electrical test passed. Support on board momentary switch, single external momentary switch, double external momentary switches and pulse signal, four control modes. LED indication for relay set and reset action. G2RL-2 8 Amp DPDT power relay. Power off relay state memory, when the power on again, relay switch will revert to its previous state. The control program based on MCU PIC12F675, this is a flash microcontroller, if you are familiar PIC firmware, you can redesign the program. Panel mount version, size: 72.5 x 47.4 x 18mm (L x W x H)