Bit is a rechargeable (I keep wanting to type "wireless" after that, but he is NOT wireless) amplified speaker.
I won Bit from Republic Wireless (republicwireless.com) – my current cell phone carrier.
Bit has a weird combo-usb/audio cable. One end is a normal micro-usb connector (if you don't know what this is, it's the connector that most phones use to charge now), and the other end splits to a full size usb connector and 3.5mm (headphone) plug.
When Bit is charging, his eyes glow red (I assume the surge of power is overwhelming and leads him towards thoughts of world domination – or at least taking out all the humans), when he's unplugged from a power source he goes back to his docile blue-eyed self, just playing some tunes and chilling. Because robots.
Oh, and his arms move. (Not on their own. He's semi pose-able)