GPO Himalayan Glow Hand Carved Natural Crystal Himalayan Salt Lamp With Genuine Neem Wood Base, Bulb and On/Off Control 8.5 to 9 Inch, 8 to 11 lbs. Helps relieving the symptoms associated with asthma and allergies in general Works as an air purifier by emitting negative ions into the air and light therapy to reduce stress and increase energy These 200 million year old salt deposits are high in minerals and trace elements Each lamp is individually handcrafted and unique 25 watt bulb, cord and dimmer switch