Large LED for easy viewingReports humidity reading every 30 secondsHygroSet adjustable technologyOne internal fanTwo external fan portsAudible and Visual low water indicatorInstructions includedMeasures: 6L x 2W x 3 3/8HOptional Accessories::HYDRASMCART Water CartridgeHYDRASMKIT Fan Kit fan splitter cableHYDRASMFAN Individual External Fans