Following the first teaser�image, girl group TWICE unveiled another group photo of the members and also an album preview.

The girls illustrated a prestigious appearance dressed in matching school uniforms. They pose in the same manner as the first teaser image except they're all smiling this time.

JYP also revealed the album preview as 'Signal' will come in 3 different versions (A, B, and C). Pre-order for the album begins today and if you pre-order, you get a few extras including a poster and an extra photo card.

SEE ALSO: Feel the Beat, Live the Words: TWICE Lyrics that speak to us

TWICE's 4th mini album 'Signal' will be released on May 15.

Stay tuned for more updates!