E Kara - Portable Karaoke Plugs Directly into Your TV Plugs directly into your TV, VCR or DVD player. Song lyrics appear on your TV screen. Song Cartridge contains: "Stronger" by Britney Spears, "Bye Bye Bye" by 'N Sync, "Independent Women Part 1" by Sestiny's Child, "I Want It That Way" by Backstreet Boys, "Yellow Submarine" by The Beatles It features multiple voice and music enhancements such as Tempo - slow the music down or speed it up, Echo - mountain top echo, shower echo or concert hall echo, Effects - soprano(raises the key of your voice), bass(lowers the key of your voice) or vibrato(adds a vibrating effect yo your voice). Requires 4 AA batteries, not included. For ages 6 & up.