Uni bonds humidity absorber helps combat the effects of unwanted moisture such as condensation mould mildew and musty smells it is ideal for rooms that are up to 10m such as kitchens living rooms and bedrooms includes 1 x device and 1 x 300g power tab 2in1 refill the 2in1 power tab lasts for 6 8 weeks when it has fully dissolved replace with the uni bond humidity absorber small refill