Help kids be sun aware for safer outdoor play! Mr Mens Mr. Tickle sun sensor watches change colour fast in reaction to UV rays, encouraging kids to take simple precautions to avoid over exposure to the sun. Perfect for holidays, festivals, or just sunny outdoor play. Simply fasten on the wrist so the sensor panel is exposed to direct sunlight, the panel will change colour, turning darker with increased UV ray exposure, there is a handy scale on the packaging to offer parents advice on how frequently to apply sunscreen or when to avoid sun altogether. A pack of 2 Sun Sensor Watches Re-useable if wiped after use & stored in pouch included Sensor panel will change colour with increased UV ray exposure Not suitable for children under 3 years due to small parts which may cause a choking hazard. Please note this is not a timepiece, it's called a watch as it's worn around the wrist.