Description Send in your original ECM with a donor. It will be plug n play when you receive them from us. After checking out you will receive a shipping via email. Print it out, affix it to your package, and take it to a UPS Store. Benz Tech Modules LLC 13502 Whittier Blvd STE H-504 Whittier CA 90605 Questions? Call us at 818 510-3375