It has an electronic time unit on which there are four 4 mm sockets, two for gates and another two for solenoid and a toggle which for release and catch the ball.

The other unit consists of heavy retort stand. The said retort stand carries two base boards. Out of them one is solenoid holding base of size 149 x 97 x 113 mm providing with two banana socket of 4 mm. when the toggle switch is on ‘catch’ position the current is flowing in solenoid and it produces magnetic field and a steel ball make a attraction toward it. Another base connected to retort stand is of steel base on which the ball is dropped having base of size 115 x 60 x 2 mm. As well as the switch is positioned on release, their breaking the contact between the solenoid and ball is dropped on steel plate and there is some time displayed on the timer.

Supplied with steel ball of 12 mm & 18 mm diameter.