One of them is Countdown which will be shown on Cart and Checkout pages. Once you enable the switcher the countdown timer will be shown as soon as any product has been added to the cart. This can help your store make those products sales quicker.
Go to XStore Control Panel > Sales Booster > Cart/Checkout -> Countdown > enable option.
Set your own texts for knocking countdown and expired message. Also, you may control minutes for the countdown.