The Peltier effect, that helps in cooling, requires water so on figure . this is often often why the BLAUX Portable AC comes with a 300ml cistern , which is an adequate capacity to remain the cooling process happening for an extended time. just just in case the water level goes low, the tank is certainly refillable. Probably the foremost unique feature of the BLAUX Portable AC. it is a 200mAh lithium unit which can be charged via USB-C at DC5V, a touch sort of a smartphone. it's enough to remain the AC running at a maximum of 8 hours. Lastly, the BLAUX Portable AC has an air filter inside it, which is analogous in looks and size because the one found in cars. It helps filter dust particles and ionizes the air so on neutralize contaminants which can cause allergies. The BLAUX Portable AC is certainly well well worth the money .