The coffee cup insulator features a high-temperature resistant ABS shell that is durable and heat-resistant, helping to prevent burns. Its ergonomic concave design helps keep the cup stable and reduces the risk of slipping or tipping. With three adjustable temperature settings, it maintains your beverage at the ideal warmth. The device includes an automatic shut-off function that turns off within 8 hours for added safety and convenience. This coffee cup warmer makes a practical and thoughtful gift for yourself, family, friends, or colleagues. Name: Coffee Cup Insulator Material: ABS, metal, electronic components Size: approximately 130 x 117 x 23mm / 5.12 x 4.61 x 0.91 inches Net weight: approximately 120 grams Input voltage: 5V Input current: 2A Rated power: 10W Power mode: USB powered Temperature range: 55°C / 65°C / 75°C Timer function: Automatic shut-off within 8 hours Compatible cup size: Suitable for cups with a bottom diameter under 76mm / 2.99 inches