The Borstein Time Platform

The Time Platform was invented by Reinhold Borstein in the 21st century to return the temporally displaced 19th century mercenary Jonah Hex to his proper time. Since then it's been used by other travelers. Booster Gold and his friends found one in the 25th Century to transport them home. Currently Rip Hunter uses a model mainly for emergency escapes. 

How it works: Usually the platform only works for one way trips since the traveler needs access to the control console. Rip Hunter has development a way to control the device via remote no matter where or when he is in time. Like most of his lab his platform only allows for the jumpers to enter if they are given clearance to be based on their genetic coding or one of his team gives their permission for the uninvited guests to enter.