Three Precise Temperature Settings: Choose from 55°C, 65°C, or 75°C to keep your coffee, tea, or milk at your preferred drinking temperature for hours. Safe Auto Shut-Off & Reminder: For your peace of mind, it features an 8-hour automatic shut-off and a 1-hour audible alert for added safety and energy efficiency. USB Power Compatibility: This coffee warmer can be powered by any standard USB port, including those on laptops, power banks, or wall adapters. Works with Various Mug Materials: The efficient heating base is compatible with ceramic, glass, and stainless steel mugs, great flexibility for your favorite cup. Compact & Space-Saving Design: Its slim, 5.1-inch profile fits neatly on any crowded desk or kitchen counter without taking up valuable workspace.