The Heartbeat personal trainer is an actual working Sega Genesis system that allowed you to connect it to excersise equipment and buy special cartridges (like Outback Joey) to use in conjunction with it. To my knowledge, Outback Joey was the only cartridge released specifically for this hardware and I've seen very, very few of these in 10 years on the internet. The item is complete with box (though, the box is weathered and was used as a shipping container when the system was sent to me years ago) and all peripherals. I don't know where the instructions are, but if I find them I will mail them to the winner at no additional charge. I'm pretty certain that I have them around, somewhere. I'll let the pictures speak for themselves about the unit, the cartridge, and all of the additional hardware. Included are the sensors (2), controllers (2), pulse monitor(1), processor (1), control deck (1), ties, aluminum stickers, double sided tape and power supply. This item shows up on Ebay very, very scarcely and you might not see another auction for this for quite some time. Low starting price, no reserve, best of luck.