Listen to Handheld Firework Slo-Mo online. Handheld Firework Slo-Mo is an Instrumental language song and is sung by UNDERscore Music Library. Handheld Firework Slo-Mo, from the album Under the Surface, was released in the year 2012. The duration of the song is 1:42. Download Instrumental songs online from JioSaavn.