An ISO Field Generator Ring.
The ISO field generator rings were devices that created a diagravitational protective aura which repelled all matter. It also had an incorporated oxygen device that recycled the CO2 into breathable air. This way, the bearer could survive any aggressive environmental condition. The rings were created and developed by Dr. Blades and Dr. Suzuki to improve the life quality of those born without their own immune system.
Despite of it's ability to repelled all matter, the field was unable to stop sound (it could be an feature of the rings to allow the user to communicate), and since the field also prevent the user from touching himself, the user must turn the rings off to cover their ear if their hearing is overload by loud sound.
Dr. Suzuki eventually sidetracked from the purpose of the rings, and decided to use them for personal profit. He enhanced the potency of the Rings with power-boosting servo circuitry and incorporated the rings in a suit, becoming the Repeller.