If you want to breathe more life into the Fischertechnik models using sounds and lights then this set is the ideal solution! Up to 3 different sounds can be placed on the sound module. These can be activated with push buttons or automatically with digital inputs. Depending on the requirement, the sounds can be replaced very simply using the USB inputs. The blink connection, which is also included, allows the operation of up to 8 indicator lights as blinking lights. Age: 8 Years and older Item size: 6.5 x 22.7 x 14.8 cm What's in the box Sound module with blink electronics USB cable 2x Indicator light Various luminous caps Battery holder for 9V block