The EH-1 (known as EH-2 outside of USA and Canada) is the quick charger for Nikon's EN-1 NiCd battery, used by the E2/E2s and E2N/E2Ns cameras (and their Fujifilm equivalents). This is the same charger as Fujifilm's AC-D5. Much to my surprise, I couldn't find the instruction manual anywhere on the web. Looking through my own stuff, I found that I already had one. So here it is:
Click on photo above for larger version, or use this link: http://www.nikonweb.com/files/nikon_eh1_manual.jpg (335 KB JPEG)
(Two pages with various warnings are not included. In short: Do not eat, do not open, be careful. You've heard it all before.)
Jarle