Comes with original instruction booklet . Vtg Kako Kakonet Type B Transistorized Compact Feather Weight Easy Operation. According to the instruction : 1. Feather weight and compact: unlike electronic flash units up to now, Kakonet B dispenses with the need of a power source pack,instead of which , small penlight batteries can be put in the flash head itself . Moreover, the adoption of the transistor circuit made this unit smaller and lighter than are other similar lighting devices. 2. The power source can be taken from the dry cell,available any place and at low price. 3. Becouse the flash duration of Kakonet - B is 1/2000 sec., you can get fast pictures . Kakonet-B simply and firmly fits any camera shoe and is designated for a truly practical use. Now you can take pleasing pictured more than ever with Kakonet - B Made in Japan