It appears that it is! On the external covering it had a light bulb symbol and the times I pushed it nothing happened (the red LED deosn't work) and people could still buzz, but I just did a test with the cover off (pushed it in, left my iphone recording in the flat, ran down and pushed the...
I have an intercom system in my flat, and for whatever reason no matter which flat is needed people buzz mine. I've been here for a week and it's already unbearabe (the worst was a woman trying to get to her boyfriend's flat at 2:30am) so I'd like to add an on/off switch to the intercom so that...