Compatible with most smartphones

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Kreativt julhälsningskort med temperaturförändring Sport & Outdoor Compatible with most smartphonesFEATURES MAGICAL TEMPERATURE CHANGE DESIGN: Simply bring a flame or heat source like a hairdryer close to the card to make the festive design light up. Watch the pattern change with temperature, offering an interactive holiday experience. REUSABLE AND AUTO RECOVERY: The card's temperature sensitive design automatically resets in about 20 seconds. Reuse it multiple times for endless fun, making it a great long lasting holiday greeting card. HIGH