Questions about a special kind of Monero wallet where incoming transactions can be monitored with the use of view key and address, but secure against spending because the private spend key is not used. Optionally, key images generated offline with the use of private spend key can be imported into the watch wallet to show outgoing transactions and correct balance.

Watch only wallets using just the view key and wallet address can monitor the balance associated with all incoming transactions.wa

Once fund have been sent from a watch only wallet (after being signed offline) key images are required in addition to the view key in order to accurately track the watch only wallets balance