Hey, I need to find out if there is a product which is a sort of transmitter / receiver. There would be two separate units. and have a shared frequency. As the two units get closer together one of them will start to vibrate and close the ore the insendity of the vibration. Or if vibration is not possible then perhaps using an led that flashes the closer the two units get together. Please note that I know nothing about electronics and and would need to chat to someone to deliver a design and prototype. Am I in the right place?