Mini Photo Printers Quite Pleased Can I Patent An Invention Without Giving A Description Of The Parts That Already Exits? Help,Assistance Please

Can I patent an invention without giving a description of the parts that already exits? Help,Assistance please - mini photo printers quite pleased

Suppose you have an idea for an electronic device is a combination of 2 or more products. Hypothetically (please do not submit their comments on the course.) I suppose it's a phone with a mini-photo printer. Since these two products, which already exists, do I have to record in detail all the circuits of the device as a whole or they can get a mobile phone with mini-printer with an explanation, because it is not the knowledge or resources to do everything before patent ?