It was mainly intended to be used with the A-model cameras. It employs the use of flash bulbs of Ag1 type.

bc flash

Battery wise, it needs the Eveready 504, available on the internet. Bulbs are available from the Evilbay, and good lots appear now and then on the dedicated photo forums, such as http://www.photo.net, in the classified section, or good photographic supplies websites.

eveready 15bulbs