Brute Ray Amplifier
From Multiversal Omnipedia
The Brute Ray Amplifier was a device constructed by a mind-controlled Bulma for Baby during his possession of Vegeta. The device could concentrate and intensify Brute Waves, and transformed Baby-Vegeta into a Golden Oozaru. Later, the device was used to transform Vegeta into Super Saiyan 4 so he could battle Ii-Shenron. Bulma's invention was destroyed by Ii-Shenron to prevent Vegeta from regaining the form after he lost to the evil dragon.
