Jack is strong – this ultrasonic humidifier moisturises the air to your preset level in rooms right up to 65m2. The switchable preheating helps to distribute the humidified air even more efficiently and potential limescale deposits are substantially reduced by the integrated anticalc cartridge. Oh, and to stop strong Jack from overexerting himself, the humidity is controlled by a digital hygrostat which ensures he only does what he is told!