Ticker tape timer, operates from 6-12V ac supply complete with 220v built in step down transformer for 6 - 12 v out put with vibrating ticker tape dot, carbon holder and tape holder stand To provide dots on tape at 1/50 second intervals, equal to the frequency of the mains supply. Operates on12 V a.c. It has an electromagnet & a spring loaded armature which vibrates above a support table. Paper tape, drawn through guides on the table is struck by a dotting screw, carried on the armature. full use of carbon paper disc. Fitted on base. Complete with one tape roll carbon paper disc , stand and apparatus ( not Part of Kit ) A pulley and weight on the table allow pullying tape with time to record by digital stop watch