seeed studio Grove - 2-Coil Latching Relay

what we have here today is a latching relay this white object here it's a 2 coy latching relay and we've got a little circuit here and the LED is lighting so the LED is going is connected through the battery through the common and normally closed so normally played closed means a circuit is closed truth to that LED now what the relay it does is it's got two coils so if I activate I call diem suppose the on turn it on coil here it turns it off but it holds that unlike the auto relays the non latching relay it stays in that position it stays switched in other words it stays which said I now have these contacts going to common normally open so we remembers that it's been switched and then you can turn change it over by activating the other coil now what I'm using here is our reed switches that we've used earlier on and so familiar with them so you can switch it switch contacts that way it