They are Developmental Disabilities Association (DDA).

that's right, I already confirm it!

They left a message,however I never donate to anyone on the phone even if it's legit,I prefer to donate to charity in my community in person.

Donation Pick-up Service

Received the call just now for the first time.  I never give donation over the phone or to anyone knocking at my door - even they are legitimate. I may trust the organization but not the person.  By the way, I've never heard of this Enviromental Disabilities Assn.