Gilson Peltier Controller Powers up, toggles engage, unit was opened by previous owners, unsure why. Port on the back (Unit 2) has some broken plastic on the threading. If there is anything wrong with the item that you have purchased, please contact us directly and give. us a chance to help, we respond quickly and will ensure you are satisfied with your purchase and experience! Please do not leave negative feedback or open any disputes with eBay or PayPal. Contact us directly and we will fix the problem quickly. We strive for 5/5 Star service! Fast shipping!