Shelly 2 looks like the unit I need to remotely control my central heating when abroad etc. I can see that 2 relays can be controlled independently by manual switch or [Android phone in my case] eg on manually off remotely or vice versa. Not being the worlds best with electronics but quite capable domestic wiring. Here is my question. In order to work the relay manually can I use a toggle switch like a ordinary on off or does it have to be a momentary switch [for 240v ? where would I get one] I intended to wire boiler with control panel with indicator showing when on or off with Shelly 2 somewhere inside. Relay 2 switching, already working, Honeywell controller for gravity domestic hot. Any advice welcome.