how does Remote Control Extender work?

[husyrts]

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 dose this thing work? There are many output out there and should I buy a new remote control?

 

[Nestor]

Not sure how that one is used, but this seems more like what you're after:

Specialized in Bluetooth, Ultrasonic, IR technologies. SainSonic 433MHz Wireless Infrared IR Remote Extender, 100M, Black makes from 3D Glasses, Smartphone Accessories, Thermometer to Beauty Machine

The extender comes as a pair. Place the Ir transmitter aimed at the equipment you wish to operate. Use the IR receiver in your bathroom and point your remote. The IR receiver converts the IR from the remote to an RF signal which can penetrate walls, to your IR transmitter, which converts the signal back to IR. Like any IR device, line-of-sight is required between your equipment and Tx, and between your remote and RX.

I suggest buying a cheap universal remote for bathroom use to prevent damage to your OEM remotes due to some unfortunate mishap involving water.

Edit:

After re-reading your post, can you elaborate on the speaker? Is is self powered with a remote?

I need a coffee!

 

[husyrts]

Thanks, It seems that the device you recommended are the one i am looking for.
But does this one Remote Control Extender for DVD IPTV Fans
use for DVD, not music player?