This listing is for a Omnichrome 160U Key Enabled Power Supply - Tested This unit has been inspected and tested and found to be in good working order. There is a 30-day money back guarantee included. 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.Fast & free shipping We strive for 5/5 Star service! Fast & Free shipping!