This is a Safe, and Effective Trading Booth. Here, players enter on either side, and when both players have enetered the booth to begin trading, you hit the left lever which locks you in. Next, you initiate the trading by hitting the right lever which opens a doorway to the movable chest below between players to allow secure trades. Once both players are done trading they close the door to the trade area, then they BOTH have to agree to leave by both hitting the lever to exit or they cannot exit.