Two modes: On and Off.

What looks like light sensor on the front is purely decorative.

2.5mm sync port

Takes two AAs

Tilt head, all the way up to vertical, 90.

Guide Number (GN) for direct flash is 20 (meters).

From PentaxForums.com: http://www.pentaxforums.com/accessor...#ixzz2arp97600