Features: Digital sight gauge operates on four easily replaceable AAA batteries with an average 1-year lifespan. Display shows low battery symbol when replacement is needed Vacuum insulated to keep coffee hot for hours Four-hour digital count-up timer Brew-through design with flip lid cover Fast flow faucet Ideal for use with Twin or Single Infusion Series Brewers Unique lid design allows the display to be forward or rear facing Soft-grip bail handle for easy transportation Sturdy aluminum faucet guard keeps faucet area clean and protected Volume indicator displays how much coffee is left inside the server