Space-saving design by CO Guardian combines an advanced carbon monoxide detector with digital clock, flight timer, voltmeter, pressure density altitude, inside/outside air temp, altitude alert, & stand-alone cabin pressure alarm into one unit that fits a std 2-1/4″ panel cut-out. The backlit digital display indicates carbon monoxide levels from 30-999 ppm (meets FAR 23.831); pilots are alerted to dangerous levels via a warning light and an 85 db audible alarm. Outputs are included for a remote CO alert light, cabin altitude light, & RS 232 for displaying the CO level, cabin pressure and temp on CNX80 & other avionics. The clock will show local & Zulu time in 24 hr formats. The voltmeter monitors 14/28V systems & instantly warns of a hi/lo condition. Sensor tested to 25K ft. Temp range: +32- 122°F. Watts: <2. Wt: 7.5 oz. 1 yr mfg warranty. Note: OAT & Density Altitude modes require optional OAT sender.