Summary: Just pop this in where your battery goes, and then connect it to the EH-5A. There's a little plug that pulls down so the cord can exit. You need this adapter if you want to use the AC power unit EH-5A. No more cycling through batteries and worring about ruining an extended exposure with my astrophotography! Highly recomended. The product almost pays for itself when you consider the cost for 3 batteries and all the headaches!
Pros: Easy to Install, Reliable, Solid Construction