 Fox's Mike Tobin in Milwaukee, where the Secret Service coordinator for the convention just told reporters they are fully prepared. Elon Musk's Neuralink company is getting ready to test its implantable brain device in a second patient. It is described as a chip which can also transmit signals outside the body to a computer interface. The device allows for a person to manipulate tech, such as a computer or a smartphone, with their thoughts and brainwaves.