The MJ Arsenal Houdini features powerful carbon filtration and smoke reclamation to discreetly eliminate odors from consumption. With a built-in electronic counter and 300 exhales per filter, it tracks usage for optimal performance. Compact and sleek, it's the perfect air filter for maintaining privacy while keeping your environment fresh and odor-free. Dimensions: 3.6“ x 1.7” x 0.8" What’s in the box:1x Houdini Filter