The Blutz Wave Generator is built by Bulma while she is under Baby's control, and is used to turn Baby Vegeta into a Golden Great Ape without the need of a tail. Later, during the fight with Omega Shenron, Bulma uses the same machine on Vegeta to advance him to Super Saiyan 4, since he lacked a tail. The generator was destroyed by Omega Shenron's Finger Beam after Bulma tried to attack him with Blutz Waves in order to defend Trunks.
A similar device existed on the Saiyan's Attack Balls. This device generates a holographic representation of a moon when the onboard computer awakens the Saiyan occupant, as evidenced by what happens when Gohan he transforms into a Great Ape for the second time during the training for the fight against the Saiyans.