GREATSSLY Portable Air Cooler Battery Operated Personal Air Conditioner for Bedroom Office Table Camping Outdoor-5000mAh Rechargeable Battery Auto Oscillation 700ml Water TankAuto Oscillation: Differ from other evaporative cooler, this is the first air cooler that supports maximum 120 degree Oscillation from left to right, cooling your surroundings and sharing the coolness with your families or friends simultaneously 700ml Water Tank: personal air condiction with a large water tank, easy to add water from the top and check the capacity from the side, if full filled, lasts up to 12 hours, so you don't have to get up to add