He use his sensors to spy all Decepticons and Autobots to gain information for Lord Megatron to info him of traders and Autobot schemes. Soundwave is the Decepticon mostly silent Communications Officer. He hardly talks in his own voice, so instead he playbacks uses other's words or phrases to communicate to others, hiding his face with a mask that displays images and soundwaves of recordings. Another trait is that he has unquestionable loyalty to Megatron unlike some others.