The box and the display unit. Below you can see what is in the box. They say a professional can install it in 10 minutes and a home owner in 30. http://www.theenergydetective.com it is a device to show you your energy usage of your entire house. It is like a whole house Kill-a-watt.

This is the MTU transmitter, you plug it into the neutral bar and a breaker first, then you put the two big clips over the Phase A and Phase B wires

Then you close up the breakers and plug the display unit in the wall, it shows your kWh right away, a simple programming of your rate, mine is 0.13$ kWh in Groton and it shows your $/H! I am in love already. My A/C is about 0.40$ an hour...