This is the crews best friend! The E Cart was designed to inform the user of any possible electrical issues before they can arise on set at that critical moment before the cameras roll or the performance begins. This device, built by AC Power and Bender, allows the crew to sort out faulty equipment in the rental house before it shows up on set! Imagine being able to check for problematic current leakage on a light at the rental house. This is when it is easiest to repair or have you rental agent replace. Because the E Cart has every common connector in the business on board, you can plug each device into the cart to make sure it gets a clear (no alarm) green light before loading on he truck!