HEAT CHANGE BAT SIGNAL MUG
HEAT ACTIVATED BAT SIGNAL MUG When the mug is cold, the Bat-signal lights up the sky-looks like there's trouble in Gotham City! When the mug is hot, the Caped Crusader appears to save the day! Of course, sometimes the Bat-signal only means the Commissioner has just put the kettle on. Microwave safe, holds 16 oz.