Who doesn’t love a good surprise? This heat-sensitive color-changing mug has a black matte finish when it’s empty, and when it comes into contact with a hot beverage it reveals your strong desire for the WiFi password!
The WiFi is strong is this one:
• Black matte finish when cold
• Reveals the print when exposed to hot liquids
• Dimensions: height – 3.85" (9.8 cm), diameter – 3.35" (8.5 cm)
• Made in China. Printed in the USA and Europe
Note that in some instances the coating might not be 100% opaque and an outline of the design might peek through a little. Also, you shouldn’t put the mugs in a microwave or dishwasher since it can damage the coating.