There a 4 different kinds of colours. With Tivoli Audio’s Model One BT with Bluetooth® wireless technology, simply switch to the Auxiliary position and after initial pairing, start listening to your favorite music wirelessly. It’s that simple. With the addition of Bluetooth® wireless technology, when you’re not listening to the Tivoli world-famous analog AM/FM tuner, you can listen to the music stored on your Bluetooth® wireless technology-enabled device. You’ll never tire of hearing your music through the Model One BT thanks to Bluetooth® wireless technology’s advanced A2DP profile, combined with the Model One BT’s trademark equalization. And since Bluetooth® wireless technology is wireless, you won’t have to dig out an audio cable for your enabled-device every time you want to listen to your music through the Model One BT. But don’t worry, the Auxiliary input is still on board, along with the Record and Headphone outputs, so you can continue to connect those “old fashioned” wired devices. The world’s simplest radio just got even simpler.