Temperature: Designed to keep drinks warm up to 45°C. Versatile: Can be used with glass, ceramic and steel. Diameter: Measures 9.2cm in diameter, to fit most mugs. Animals: Choose pink panda, blue cat or navy rabbit. Cup warming pad: Get a USB mug warmer mat! USB: With a 1m USB cable compatible with most USB ports. Usb Mug Warmer Mat | Blue | Living Social