PortalBlox

The Twin Portal Gun is a teleportation device that allows you to create two linked portals and instantly travel between them. Right-click on any block surface to place portals, which will alternate between orange and blue with each placement, accompanied by colored particles and sound effects. Once both portals are placed, hold Shift and right-click to teleport to the opposite portal—the device automatically detects which portal you're closer to and sends you to the other one, negating any fall damage upon arrival.