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description: no water tank design: converts a standard sized (3cm dia.) water bottle into a moisture-producing water tank. portable and convenient for use. 2 power supply ways: powered by 3pcs aa batteries(not included) or usb port by computers, cars, power banks, etc. timing function: adjustable timer allows for 2, 4, 6, and 8 hour automatic shut-off. non-slip bottom: there are anti-slip rubber pads on botton which ensure the stable and firmly standing. convenient indicator light---each...