Bunn 1 Gallon Digital Sight Gauge ThermoFresh Server without Base (Stainless Steel)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 Unique lid design features a pour spout for easy emptying and cleaning Vacuum insulated to keep coffee hot for hours Volume indicator displays how much coffee is left inside the server Four hour digital count up timer Soft grip bail handle for easy transportation Brew through lid