In the quest, the player takes a metal crate to Ava in order to get a device that can detect buried metal items. She then takes your accumulator and adapts it to search for exact same metal boxes. If the alerter is lost it can be re-obtained from Ava by using the 'Buy Device' option and selecting the Alerter. This will get players a new Alerter (for 999 coins and 75 steel arrows).