This system will allow you to control the electronic engines RPM. It gives you a set engine speed, remote engine stop and start of the engine. It also allows you to feed your crane/radio and your cooler fan power. This system takes the radio remote signals or the manual switch signals (Positive or Negative) and converts them to allow them to control the engines RPM, turns on your crane/radio, cooler fan, stopping and starting of the engine. The EDR IV body measures 5"X5"X2". The body and connector are both weather proof, allowing for versatility when you are installing the system. This product is very reliable and comes with a limited Lifetime Manufacturers Warranty.