This E-Z Euthanex Smartbox M1 Auto CO2 System is in great condition, has been tested and is guaranteed to be functional with a 30 day return policy. This unit came from a local lab that had surplus equipment. We urge customers to view all photos as they show overall condition, included accessories and functionality. Listing only includes what is shown in photos and does not include any additional accessories. Please feel free to contact us with any questions. Please Note: System includes a foot pedal to manually turn the system on and off. It is unclear if the off switch (located on the control panel) is faulty or if it is a manual override when the system is locked in a cycle. We plan to test further and will update listing when we do. For additional information please see last two photos. M1-SBFF SMARTBOX Chamber System with Flow Meter Compliant with AVMA Guidelines Accommodates up to 40 shoebox mouse cages or 8 standard rat cages M1-SBFF-1FM (20 mouse/4 rat cages) M1-SBFF-2FM (40 mouse/8 rat cages) Operates either one or both chambers After starting system, technician is free to do other work Presets can be customized based on facility requirement Automation virtually eliminates operator error Electronically monitored safety system prevents operation when chamber door is not properly closed Doors automatically lock during operation and unlock after evacuation Two preset times ? adult and neonate The M1-SBFF SMARTBOX Chamber System with Flow Meter automates a three-stage euthanasia cycle at the push of a button: charging, dwell time, and exhaust. At the start of a cycle, doors automatically lock and will not unlock until CO2 evacuation is complete. The clear polycarbonate doors provide visibility while the front-loading, swing-down design offers easy cage access. Airtight, gasket-sealed doors prevent gas leakage during operation. The manifold design ensures even gas distribution. The system accommodates the full range of rodent cages from all manufacturers. The M1-SBFF Chamber System is designed for use with house supplied gas. An EA-6500 Multi Tank Heater Assembly is required to use with CO2 cylinders for the Dual Chamber System (included).