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, sleek and disposable, it's the perfect air filter for maintaining privacy while keeping your environment fresh and odor-free. Retail Unit: Single Dimensions: 3.6“ x 1.7” x 0.8" Packaging Size: 3.8" x 1.9“ x 1.0” Disposable Device with Biodegradable Plastic Carbon Filtration Exhale Smoke through Houdini for odorless air Portable Easy-To-Use Built-in Puff Counter Approx. 300 Uses