How can i remote control my speakers?

I don't know whether this thread belongs to there, but I do need to someone to answer this for me.

I have a speaker in my bathroom, but when I want to play music, I have to go to the living room. Is there any remote control extender which can achieve this?
I have saw such one named Remote Control Extender for DVD IPTV Fans, seem like this device can achieve this.
It says that the Emitter Range: 5-10CM, so that is enough for me to conrtrol this speaker in my bathroom.
But, how does this thing work? There are many output out there and should I buy a new remote control?