Section 158Omnibus Election Code of the Philippines (Batas Pambansa Blg. 881), Sec. 158

Voting booth. - During the voting, there shall be in each polling place a booth for every twenty voters registered in the precinct. Each booth shall be open on the side fronting the table for the board of election inspectors and its three sides shall be closed with walls at least seventy centimeters wide and two meters high. The upper part shall be covered, if necessary, to preserve the secrecy of the ballot. Each booth shall have in the background a shelf so placed that voters can write therein while standing and shall be kept clearly lighted, by artificial lights, if necessary, during the voting.

The Commission shall post inside each voting booth and elsewhere in the polling place on the day before the election, referendum and plebiscite a list containing the names of all the candidates or the issues or questions to be voted for, and shall at all times during the voting period keep such list posted in said places.