Make your HDX vault even faster with Liberty's AC adapter. The AC adapter for HDX models keeps your vault "awake" and ready to go! With the AC adapter plugged into the unit, access to your vault is under 1-second. Without the HDX AC adapter, HDX vaults require an additional second to "wakeup" (less than 2-seconds total). HDX-150 vaults DO NOT come with this AC adapter, while HDX-250 vault includes the AC adapter.CAUTION: Use only Liberty's AC Adapter for HDX 150 & 250 Vaults on HDX Smart Vaults.Â Using any another AC adapterÂ could damage the circuit board inside the HDX vault and voidÂ the warranty. NOTE: Factory installed accessories and options are subject to specification changes/upgrades without notification.