Indian voting machines use a two-piece system with a balloting unit presenting the voter with a button (momentary switch) for each choice connected by a cable to an electronic ballot box.
An EVM consists of two units:
* Control Unit
* Balloting Unit
The two units are joined by a five-meter cable. The Control Unit is with the Presiding Officer or a Polling Officer and the Balloting Unit is placed inside the voting compartment. Instead of issuing a ballot paper, the Polling Officer in-charge of the Control Unit will press the Ballot Button. This will enable the voter to cast his vote by pressing the blue button on the Balloting Unit against the candidate and symbol of his choice.
The microchip used in EVMs is manufactured in Japan and it is sealed at the time of import. It cannot be opened and any attempt to rewrite the program cannot be done without damaging the chip.
The cost per EVM (One Control Unit, one Balloting Unit and one battery) was Rs.5,500/- at the time the machines were purchased in 1989-90. Even though the initial investment was somewhat heavy, it was more than neutralised by the savings in the matter of production and printing of ballot papers in lakhs, their transportation, storage etc., and the substantial reduction in the counting staff and the remuneration paid to them.
http://en.wikipedia.org/wiki/Indian_voting_machines
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