Green Power Ring

Origin    

Alan Scott's Ring

The Guardians of the Universe gathered all random magic and fused it into the Starheart, which gained sentience. A piece of the Starheart fell to Earth. It was fashioned into a rail road lantern which, during a train disaster, saved Alan Scott of Earth. Creating a ring from part of the lantern, Scott fought crime as the "Green Lantern."

Alan Scott's power ring has many capabilities. It creates anything the wearer can imagine and it gives the wearer the ability to fly, but it's magic cannot affect wood. The ring must be recharged every 24 hours by touching the Green Lantern for 10 seconds. 

Original Corps Rings

These rings, just as Alan Scott 's, create/do anything the wearer can imagine, but this time their powers included time travel, and they also allow the wearer to fly.  The ring's potency depends on the willpower of the wearer.  The rings can also create duplicates of themselves.  Reserve power automatically protects the wearer from mortal harm.  The ring must be charged every 24 hours by touching the battery for 10 seconds, during which time the Green Lantern will usually recite their oath, and it's energy cannot affect anything colored yellow.
 

Oan Power Rings 

A Guardian's Oan power ring

In the days before the original Green Lantern Corps, the Guardian known as Meadlux created a power ring specifically for the Guardians.  An Oan power ring possessed the same capabilities as a standard ring, but was fueled by the internal power of its wielder and thus did not need to be recharged.  Unlike the traditional Green Lantern power ring, an Oan power ring did not contain the impurity that restricted its capabilities against materials colored yellow.  The revelation that such a weapon existed caused a great schism within the ranks of the Green Lantern Corps.  Officers who had lost close comrades due to adversaries empowered by yellow weaponry lost faith in the Guardians, some of whom, such as Galius Zed, Eddore, and Kaylark even went so far as to turn their backs on the Guardians, coveting the rings for themselves.  Another group of individuals who took an interest in the Oan power rings were the space pirates known as the Free Lancers.

Power Ring's Power Ring

Power Ring, a member of the Crime Syndicate of America, wielded a Power Ring that utilized mystic energy, enabling it to fight and sometimes even overcome even CSA Superman. It's powers were the same as Hal's, but without the yellow weakness, or Alan's wood weakness. 

Kyle Rayner's Ring

Just as the rings before him, Kyle Rayner's ring creates anything the wearer can imagine and allows the wearer to fly. This special ring though is keyed to Kyle Rayner's DNA. It can only be used by him, those related to him, and Hal Jordan. The power supply is expended according to what the ring creates rather than the length of time since it's last recharge. The ring must be recharged by touching to the battery for a period proportionately equal to how "empty" it is. It gives the wearer a sense of "full" or "empty." Rayner's power ring is invulnerable to every known substance. 

New Corps Rings

Also with the destruction of Parallax came the removal of the "yellow impurity," as it is now called, and only new Green Lanterns have trouble with the color yellow. They must feel fear, and overcome it, before they can effect the color yellow. Other than this, the new rings are almost exactly like the original Corps' rings. 

Other Ring Colors                                               

• Yellow Unlike the Green Rings of the Corps which operate by channeling pure willpower, these rings which are forged on Qward channel pure fear. Several versions of these rings have been created, but recently they have become the primary weapon of the Sinestro Corps, seeking out individuals to battle the Green Lantern Corps who have the ability to instill great fear.
• Blue Blue Power Rings are shown to symbolize hope, and were forged by Ganthet and Sayd, two former guardians. The Blue Lantern Corps' rings only work when an active green lantern is present.
• Red Red rings channel rage and hate. They appear to manifest their power out of the wielder's mouth. It hasn't been confirmed yet though.
  
• Violet Violet rings, forged by the Zamarons, are shown to embody love.
• Indigo Indigo rings are fueled by compassion, and its users are ambassadors of goodwill and are much like shamans
• Orange Orange power rings are based off of avarice, also known as greed.
• Black A massive black lantern surrounds the Anti-Monitor's body as he lands on an alien planet. It is revealed to make a black power ring, which latches on to the dead. They will bring the Guardians' prophesied "Blackest Night."
• White The white power ring attached itself most notably to Boston Brand at the end of Blackest Night after resurrecting him and the other previously dead heroes. 
  

Abilities Of The Rings                                        

• Animating: A Green Lantern can will things to move how he wants.
• Artificial Intelligence: Every ring has a connection to the Main Battery on Oa, which taps into an artificial intelligence. It acts as an "on-board computer," telling the wearer what they need to know. It can either respond out loud, or silently directly to the wearer's mind. The AI contains a large database of information that may be crucial to a Lantern's success. The ring also translates nearly every language to and from the wearer (though they have difficulty translating profanity), which is why the Corps can communicate with each other. When the bearer of a Green Lantern ring dies, the ring will seek out a suitable replacement for their sector. The AI can be used to play a holographic playback sequence complete with colors across the spectrum based on information in memory banks. The ring can dictate when to pause or stop the playback should an interruption arise where the Lanterns undivided attention is needed. The AI can also alert the wielder of incoming threats or of attempts to manipulate the wielders construct by an outside party.
• Burglar Alarm: A Green Lantern can coat anything with the ring's beam and thus, if anyone other than himself touches it, his ring will glow, alerting him to the possible theft.
• Communicator: The ring can act as a personal communicator between Green Lanterns. They have also been seen connected to telephones.
• Costumes: The wearer of the ring may create any costume they choose, based on their personal preferences, whenever they choose. The ring projects the costume over any clothes already worn at the time. The only rules that the Guardians of the Universe implement on the creation of a individual costumed is that the ring bearer display the insignia of the Green Lantern Corps.
• Energy Projection: The rings can also project beams, form protective bubbles and force fields, and fire destructive blasts. Sometimes, depending on the wearer, the beams and blasts make sounds. Kilowog's ring is one such example of blasts making sounds.
• Energy Constructs: The rings can construct anything the wearer can imagine from hard-light energy, as long as they are willing to make it. The more determined the wearer is, the more complex and intricate these things can be. The constructs can even be so complex as to form working machines, computers, and even people.
• Flight: The ring allows the wearer to fly in atmosphere or in space, and can achieve incredible speeds, moving from planet to planet in a matter of hours.
• Invisibility: The ring can make the wearer or anything else invisible.
• Matter Manipulation: A Green Lantern can use their ring to manipulate nearby matter, such as water, for various purposes such as a construct that acts like an energy construct but can block something yellow and may serve a purpose that an energy construct couldn't perform.
• Mind Control: The wearer of the Ring can use it to plant post hypnotic commands or control a person.
• Mirages: The Ring can create mirages/illusions.
• Phasing: The ring allows the user to go through walls. This ability however required great concentration on the bearer of the ring
• Power Absorbing: In the JLA's first fight with Amazo, it was GL who defeated him by drawing out all of Amazo's powers. In Green Lantern/ Silver Surfer: Unholy Alliances, Kyle defeated Parallax with SS' power and Thanos with Oa's energy by drawing out all that extra energy from them which made them unconscious. However he couldn't hold all that power nor could his Ring like Hal did with Amazo's powers, so that move isn't often used with so much power.
• Probing: The ring can probe the Lantern's or another person's mind, allowing him to uncover memories or the person's thoughts.  (An ability which has not been seen for some time)
• Recharging: The rings need to be recharged by means of a Power Battery. Other large sources of power may be used to recharge a power ring, however effectiveness may vary. The internal power source of a Manhunter Android is, in effect, the same as a power battery, and can be used to recharge a power ring. During the JLA / Avengers crossover, a Cosmic Cube was used to recharge a depleted ring, although this is not an ideal solution and is available if there are no other options.
• Ring Duplication: Each ring can duplicate itself, creating a second ring which may be given to another as a backup, for protection, or to help the lantern in times of great need. This duplicate ring is exactly like a normal ring.
• Temperature Control: The Ring can increase or decrease the temperature of anything, even something as large as stars, or even create bubbles of intense heat or cold, even down to Absolute Zero. This could be seen in the recent Sinestro Corps War when Sallak used his ring to incase an enemy in a force bubble an incinerate him.
• Transforming (former): The ring can transform anyone or anything, be it into an animal, altering their state of appearance, or their size. Once Hal and Alan turned the two Flashes ( Barry and Jay) to light protons in order to free them from prisons.
• Electro-magnetic scanning: The ring can allow(through the use of x rays) the user to see through walls, without the people on the other side knowing. it can also scan along the Electromagnetic spectrum.
• Wormhole/Warps: The ring can open wormholes to cut down on distance.
• Healing: A wielder can command a ring to heal him/her/itself of any injures incurred. It can also heal others. This ability however cannot regenerate lost limbs.
• Energy twin: The ring can create an energy copy of the wielder which is connected to the ring wielder, any information the twin gathers is transferred to the wielder upon touch while others cannot see this twin apart from fellow Green Lanterns. (An ability which has not been seen for some time)
• Pocket dimension: Within the ring is a pocket dimension which can altered to the wielders specification. It can be used to contain opponents.
• Sub-routines: The power rings have inner programmings or mechanisms which can executed without the users permission. One such sub-routine is the autoshield. This shield automatically protects a wielder from external harm and has been proven to be capable of protecting the wielder from planetary level attacks.

Weaknesses