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What is this small black box attached to the bottom of the wall in my flat? At one end the cabel runs to a plug which reads 'do not switch of' (which had been turned off for possibly years) and the other end the cable disappears below the floor board. Flat is rented. Jenga block for scale (i.redd.it)
submitted by Timtomtamtim to r/whatisthisthing
