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3. Matters needing attention: The sensor water cup needs to glow when you water but it will not glow without water. Product Type: LED flash LED light cup 7. Lighting time: 20 hours 1. Automatically change the LED color after adding water or . 4. Material: glass Packing: 1 water cup 6. Battery power: Built-in button battery can be replaced; 2. 3D design surrounds the cup. 5. Volume: about 260ml ml Large Clear Mugs Star Mug Set Tall Ceramic Coffee Mug Set Sugar Glasses Drinking Set Custom Glasses Personalized Set Clear Coffee Mugs Set