<P> The Knockout Rounds were also introduced in season three . A pair of artists within a team are selected to sing individual performances in succession . They are not told until a few minutes prior to their performances who their partner is . The artists get to choose their own songs in this round, although they continue to get help and advice from their respective coaches . At the conclusion of the performances, coaches would decide which one of each pair gets to advance to the next round . Just like in the battle rounds, the coaches can steal one eliminated artist from another coach starting with season five . </P> <P> The "Battles, Round 2" were introduced to replace the Knockout Rounds in season six . Similar to the Knockout Rounds, each singer is paired randomly within their team . One celebrity key adviser also assists all four of the coaches and their teams in preparation of these rounds . Coaches give each Battle pairing a list of songs and each pair must agree on which song to sing . Each coach can still decide which of their singers in each pair will advance to the next round . The coaches are also allowed one steal . However, the Knockouts were brought back in season seven . </P> <P> In the final live performance phase of the competition, artists perform in weekly shows, where public voting narrows to a final group of artists and eventually declares a winner . The coaches have the power to save one artist that had not received the public's vote that week . As of season two, these artists would give a last chance performance to win their coach's save . However, in deciding who moves on to the final four phase, the television audience and the coaches have equal say . With one team member remaining for each coach, the contestants compete against each other in the finale, where the outcome is decided solely by public vote . In the first two seasons, one contestant from each team would advance to the final four . Due to the possibility of having multiple potential winners on the same team, eliminations were adjusted in season three to eliminate contestants who earned the lowest number of votes, thus not guaranteeing a coach and a contestant in the (reduced) final three (having reverted to four since season seven). </P> <P> In a first for a music competition series, NBC and Universal Republic Records offered fans of the show the ability to vote for their favorite artists by purchasing the studio versions of the songs that they perform on the live show each week via the iTunes Store . Alternative methods of voting can be done through toll - free phone calls (until season 8), text messaging, the show's app, and through online votes via NBC.com and Facebook . Each method is limited to ten votes per user . Voting lasts until noon EST the next day . </P>

When do they announce the winner on the voice