contact them and they will send you a nondisclosure to sign prior to submitting your ideas.
This is a reminder for everyone. Please do your submission in a professional manner. Do your homework first before contacting them and make sure your product is not already on the market. More than 80% of submissions are for products that already exist because the Inventor did not take the time to do the proper research. Make sure your sell sheet is accurate and the benefits are listed. DON'T waste paper telling them how long you have been working on this idea or that you built your prototype in your backyard, garage, etc. They don't care. All they want to know is how it is going to make them money. Make sure your contact info is on the material. Do not send prototypes unless requested by the company. You can let them know you have a prototype available if they are interested. Once you send the material give them reasonable time to review it and answer back. DO NOT send it on Monday and call them Tuesday wanting an answer. Don't laugh a large percenatge of you do exactly that and then wonder why the company rejected your idea.
Inventing is a business TREAT IT like one.