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The Cerulean TX attaches to an iPod's Dock connector to give it stereo streaming features, without using either batteries or drivers.

Docking its partner, the Cerulean RX, with a set of standard iPod speakers turns them into an output for the TX-connected device, whether an iPod or a Mac or PC. Again, it requires no drivers, and will automatically seek out and pair with TX-equipped iPods and computers.

The third member of the line-up is the F1, which combines a stereo Bluetooth earphone with a mono mobile headset. Again it connects wirelessly to a TX-enabled iPod, but also works as a standard Bluetooth headset for mobile phones, connecting to both devices at the same time. It will then automatically switch between the iPod and phone when it detects an incoming call.

All of the products are expected to ship next month. A pack combining the TX and RX will cost $149 (£74 at current rates), while the F1 is expected to retail for around $129 (£62).