The Ballot Unit (BU) The Ballot Unit is the voter interface and voters only interact with this unit and not the Control Unit. It consists of a permanently fixed interconnecting cable which connects the Ballot Unit to the Control Unit, ready lamp buttons, one register lamp button, slide switch window, and 15 candidate buttons. A ballot paper is inserted under the transparent screen of the Ballot unit. Voting using EVM The EVM does not change the existing voting pattern but only replaces the issuing of a paper ballot by the press of a green button on the Control Unit and instead of the voter marking or making a cross on the ballot paper, he/she will be pressing a green button corresponding to the political party or candidate of his or her choice. The voter then has to press the red Register button on the Ballot Unit to complete the voting process.