I could disconnect one of mine from the mains and measure it (not very accessible) but I would expect them to be in the region of 10w or even less.
Of course after a while with no signal they automatically power off, so consumption is not really an issue at all.
Amps are the ones that sometimes tend to have high consumption even when sitting idle. Mine draw over 200w during the night, which all adds up week after week, month after month