308 Series: A multipowered version of the 305 Series, for users who require longer operating periods from an external power source. Like all Impact portables, these have been "shaked, baked, beat up, and frozen", to perform in the world's most extreme environments. It exceeds all clinical performance standards, and is available with/without a vacuum gauge/regulator, disposable or reusable collection canister, and/or aeromedical certification.