Ultrasonic humidifier hygrostat touch sensitive controls warm mist 240 v ce weee rohs series stadler form jack power 135 watt room size 60 m maximum room size 160 m water tank 5 litres power settings 3 max noise emission 29 db upper temperature limit 21 c operation ultrasonic humidifier timer dimensions 23 x 31 x 16 cm weight 32 kg