Toshiba Satellite L305D-S5934
there's 2 manuals on the product page, none of them wish to load for me, but maybe they'll work for you
typically, laptops have 3 audio ports that are configurable using the sound card software installed on the laptop. Basically, line-in is usually maked as a circle with arrow going into it. Regardless of markings, you should be able to plug in, the software should come up asking what did you plug into the sound jack, you select line-in.