Lower Power RFduino Bluetooth controller.

[kaiserreich]

I just came across this in kickstarter.
Here is the eetimes details.

http://www.eetimes.com/design/microwave-rf-design/4409923/RFduino-joins-open-source-RF-movement

seems like a  pretty nice device to probably implement a compact wireless numpad

[agodinhost]

RF means radio frequency, so it's radio (this one seems to operate in  the 2.4-GHz band, at least is what it's site says).

It's not a new idea in the arduino world.

There are already a few good solutions out there if you do like RF (see JeeLabs, JeeNode USB) but RF is kinda cranky, imo, sometimes you will lost connection depending on outside noise/interference and it will make you crazy ...