• Innovative clock powered by energy generated from chemical reactions of water. • No batteries required, uses magnesium and aluminum elements, safe for the environment. • Works by adding clean water; recharges when the display turns off. • Allows customization with different fragrances according to your preferences. • Product dimensions: 8.2 cm wide, 7.7 cm high, 8.8 cm long. • Product weight: 0.08 kg.