TrolMaster AS-1 CO2 Alarm Station (Audio/Visual) with Cable SetTrolMaster (AS 1) CO2 Alarm Station Audio Visual CO2 Safety Alert System with Cable Set Ensure a safer growing environment with the TrolMaster AS 1 CO2 Alarm Station, a reliable safety system that alerts growers to elevated CO2 levels using both audible and visual alarms. This complete set includes the DSD 1 dry contact station and the AS 5 alarm module, which can be mounted inside or outside of your grow room or facility for maximum visibility and