PRAM Battery: 3.6V lithium (Maxell ER3S, Radio Shack 23-026)
Minutiae:
Can be used as a Macintosh computer or as a remote controlled Television. Simultaneous use of Computer and Television is not possible. Mac TV also functions as a CD player with built-in speakers.
Serial Port with the phone icon supports synchronous modems, with handshaking supported on the output, but not the input.