Feature The insulation base uses aluminium alloy heating plate PTCS heater. Low power can heat up quickly and keep coffee warmer stable continuous heating anti-overheating technology waterproof panel design no leakage current. Automatic shut-off: our cup warmer with automatic shut-off function after 4 hours of work. Three Temperature Control: Our electric cup can reduce the cooling speed of hot drinks. It can also heat the coffee to 104 F / 40 C-55C/ 55 C- 65 C/65 C- 75 C which is maintained all day long. It is neither too hot or too cold. Various cups: whether you are cups glass pots ceramic mugs stainless steel kettles glasses and milk bottles you can heat them. This USB desktop coffee heaters is the perfect gift for family and friends on Christmas Valentine's Day Thanksgiving and birthdays. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Parameters: 120V 60Hz 30W Insulation temperature: 100F-170F (40C-75C) Gear adjustment: high medium and low three gear adjustment Digital display: temperature time display Timing adjustment: 2-12 hours timing shutdown default 4 hours shutdown Operation mode: touch button Safety method: touch switch + gravitys sensor double protection Heating diameter: 9.5cm Heating surface: aluminum alloy Wire length: 1.5 meters Size: 150X120X25mm includes: 1x USB Coffee Warmer "