Vivitar Auto Electronic Flash Unit Model 273 battery powered,with aditional Grip for tripod mounting.There is I believe a base rail which will be included if I find it and a connection lead .Both missing at the moment but will add on when available.There is a very good instruction book .
I believe it is compatible with any hot shoe camera so lead not necessary for this .
weighs 10.4 ozs without batteries, 4x aa 1.5 v ,