ST-8000C Portable air cooler works great in dry conditions under 50% humidity. 1 Year warranty ensures your enjoyment and confidence in this Portable air cooler. Fast shipping and Easy ordering. Portable air coolers save money compared to traditional Portable air conditioners and cool large areas at the same time.Built in Ionizing air-purifier. Uses regular tap water. sleep mode withthree air speed. Portable and easy to move any-ware coolsany area of the house. Timer:from 0.5 to 7.5 hour setting.