This website is an Ethereum public key tracker that allows users to monitor transactions made on those addresses. The homepage consists of a form that allows entry of up to four Ethereum public keys along with their associated pseudonyms. Upon submission, the form calls the Etherscan API to retrieve the latest transactions made on these addresses and displays them in a list format in the "All Transactions" section. Unread transactions are marked with a red "New" badge. 

The site also allows users to configure an audio alarm to be alerted in real-time when a new transaction is made. The timer at the top of the page indicates the time remaining before the next automatic transaction update. Read transactions are saved locally to be recalled during future visits.