Sylvania Blue Dot MAGICUBES 3- Pack Box- 12 Total Flashes. Made by GTE Sylvania, Inc. Use with all 110 pocket and X-Type socket cameras equipped with special Magicube release pin. WILL NOT FIT CAMERAS THAT HAVE CROSS-SHAPED SOCKETS. This unique Magicube requires no batteries. It is fired mechanically, not electrically. Each flash is automatically triggered by a striker pin when it is released from its mounting in the base of the Magicube. No vibration is transmitted to the camera. Each bulb is safety coated. Keep cubes in carton until ready to use to avoid damage and unexpected firing.