Voting the House of Lords is a physical process.
When a vote – or ‘division’ – is called Peers literally divide into two groups, those in favour (Contents) and those against (Not-Contents).
Tellers are appointed for either side and peers proceed into one of two lobbies on either side of the Main House of Commons.
There is a lobby for the Contents, and a lobby for the Non Contents. Peers are counted on exiting.
Unlike the Commons, the chair does not have a casting vote and may vote in all divisions.