Detector is Signal-P's tenth album; the previous being the Exit Tunes compilation EXIT TUNES PRESENTS THE BEST OF Dios／シグナルP. The title of the album is based on the song of the same name; "Detector" sung by Len. It consist of 9 tracks, with one of the tracks being a remix of Toraboruta-P's "Kokoro".
It was first released on VOC@LOID M@STER 20, with new tracks on the album being "Kenka Sayonara" sung by IA, "Farewell Forest" sung by Kagamine Rin, "Detector" sung by Kagamine Len, and more. The album comes with a 12 pages full color booklet as well.