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Chances are that if you use the Bluetooth in your phone, it's to connect wirelessly with Bluetooth speakers or your car. But the trade group that helps promote Bluetooth recently held a showcase to show off some other, perhaps unexpected uses, such as the LUMO, a sensor your wear around your lower back so that your mobile phone can help you work on your posture.

"It gives me a gentle vibration when I'm slouching to remind me in real time that I'm slouching," says Monisha Perkash for LUMO Back. "And in the app, there are all sorts of features, including a fun little avatar that emulates your movements. So when you slouch, it slouches. When you're straight, it's straight.

That'll be out next month for around $150. The hipKey, meanwhile, which will be out in the next few months for less than $100, acts as a wireless leash. Attach one side to something you don't want to lose, such as your keys, your briefcase or even your child. Their belt loop and your phone will tell you when your loved thing or loved one is getting too far from you.

"If suddenly, the child takes off looking at something, a balloon and running away, then you would be notified on your phone and immediately be thinking 'OK, where's my child?'" said Danny van der Poel of Hippih. "You can set different distance, sort of security ranges, from around two to five meters up to 50 meters."

And finally, have you ever wanted to control the lights in your home remotely but were a bit intimidated by all the setup that would be required? Well, developers of the Blueclick Home Bluetooth Light Bulb created a light bulb that you can just screw in and can control, even change its color, using your mobile phone.

"You can have several LEDs in your home," said Kornel Halmos of Blueclick Home. "In one application, you can control up to four bulbs. Later on, it's going to be up to 40, and one bulb can be controlled by four devices."

Developers of the Blueclick Home Bluetooth Light Bulb expect it will go on sale in January for between $20 and $50.