Crystal salt stone and base together, plug in USB can be used This salt lamp baby has multi color changing function,it has LED light inside,no need for you to install,great decoration for home and office,saves space while being stunning, keep your anxiety under control Extract high purity of crystal salts from Himalayan mountain, elaborately hand carved crafts, can be used for lighting, decoration and air purifying Releases negative ions into the air, creating an effect similar to an ionizer, purifying the surrounding air This process is enhanced by the natural process of NACL resulting in the production of negative ions which eliminate the positive ions which are present in our environment, produced by computers, refrigerators, televisions and more Thus these lamps make the air clean, fresh and healthy to live in Amber crystal salt rock lamp, creates a unique ambience, makes you feel peaceful and helps to sleep Once lit the natural himalayan salt lamp,LED light will emit a calming Amber color and will automatically slowly switch colores between: Orange, Blue, pink, red, green and purple Suitable for people who sit for a long time,frequent use of computers,suffer from allergies,do yoga or meditation very often,elder or weak,smokers,recurrent insomnia Note: Because the material is natural salt from the Himalaya mountains, the color and shape of the stone may be slightly different from the picture. We will do our best to meet your requirements. Hope you can understand LightColor: Colorful The width is about 8cm, and it is about 12cm long (natural stone, each shape is different) USB Wire: Length 140cm Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Contents: 1 x Himalayan Salt Night Light with USB Cable