This revolutionary lamp plugs right into any USB port. With a powerful LED light, the lamp can be left on as long as desired, although it is recommended to keep it at a minimum of 1 hour per day. This gives the lamp a chance to release negative ions into the air to help neutralize the harmful electromagnetic energy (positive ions) that emanate from your computer screen.
Be cautious not to place the lamp in humid areas (bathrooms or laundry rooms) as moisture naturally builds up around salt. The salt will otherwise last indefinitely. If salt crystallization does occur, simply wipe off with a damp cloth.
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Monica: more than a year ago
There is no mention that this lamp changes colours-red, green,purple,blue and white-not pleasant,I just wanted the white. It says the bulb will last thousands of hours-there is no way to change the bulb. I have had this lamp less than a week,and already the only colours that work are red and green. Not happy at all-am looking into returning it.