Zeta CO200 Standalone Carbon Monoxide Detector from Zeta Alarm Systems. It has been designed with the same dimensions as a standard 2 gang fitting, so can be installed either surface mounted with its own backbox, or with a standard recessed box for semi-flush mounting. It can be powered either from 230V AC mains or from a DC supply (9-28V DC).

It has a built-in bar graph display to show the current CO level reading and has a 2-stage relay output that operates at the first alarm level (100ppm) & second alarm level (200ppm). There is also a 5-volt alarm output capable of supplying 200mA. It has power, fault & alarm indications, as well as a control button for the mute (press) and reset (Press & hold for 5 seconds).