Compatible: iPod touch 2G/3G/4G, iPhone 3G/3GS/4, iPad/iPad 2
Kanex AirBlue Portable Bluetooth Music Receiver
If you own a speaker without integrated Bluetooth wireless hardware, Kanex's AirBlue ($49) is here as another solution to add the feature via an aux-in wired connection. Equipped with a Bluetooth 2.1 chip and a DSP co-processor for audio and voice filtering, AirBlue has a rechargeable 10-hour battery inside and a play/power button on the top, enabling you to send music wirelessly from most iPod touches, iPhones, and iPads to the puck-shaped accessory, then through it to the included 3.5mm to 3.5mm or stereo RCA cables. A mini-USB to USB cable is also packed in for charging.