Made of wood, glass, metal and acrylic. The crystal on the front flashes blue, whilst the valve on the side flashes through the colour spectrum (RGB). Can be attached to a hat or worn on a waistcoat (vest) or jacket. The LEDs are powered by a 9v (smoke alarm) battery (supplied). Operation is simple, with the flick of the switch the device springs to life. Measurements are approximately 130mm wide x 130mm high x 70mm deep. Please note this is not a toy and unsuitable for children under the age of 16.