Find me a Manufacturer

Dear friends We are looking for a manufacture to build us a new Bluetooth headset. we are making totally a new revolutionized Bluetooth device. We need to manufacture 4000 Bluetooth device. Your responsibility is to find a right manufacture. - find a manufacture that could build exactly what we need with the requirement document we will provided you. - main question is that can we have a manufacture to build batter very narrow and small. and how much does it cost . - how much would it cost us to build some thing like this. - how much would the prototype cost ?? Question for you: Question 1: Have you done this before ??? give us an example. Question 2. Do you have a references for doing some thing before. can we call your reference to double check ??? Question 3. Do you speak chines ??? Could you talk to manufacture to implement this design. Question 4 : Can you read chines contract and write chines Contract. ???