Lobsters use a system of pheromones (airborne chemical messengers) to communicate their identities, sex and reproductive status to other lobsters. In addition, they also have chemoreceptors in their antennae that can detect the type and location of food sources. Lobster antennae are located at the top part of their head. They are used for smelling food (mostly). Lobsters also have various parts on the edges of its front two claws that allow it touch things like rocks or even another lobster’s body without coming into contact with them.
This allows it to identify objects and feel what is around them as well as uses its claws for grasping and holding onto things when moving.