The AERO 455 panel mounted Pulse Oximeter and Carbon Monoxide (CO) Detector is a compact unit that conveniently mounts to the panel allowing pilots and crew to measure blood oxygen levels and heart rate along with cabin temperature, cabin altitude, and accurate CO detection in the cabin with display on an external unit. This TSO certified device is designed for owners and pilots of certified aircraft who require protection from the dangers of hypoxia while flying at altitude and from carbon monoxide in the cabin.The built-in pressure sensor reminds pilots when supplemental oxygen should be used at 10,000, 12,500, and 14,000 feet. If the CO levels climb above 50 ppm, a loud 85 dB audible warning will sound along with a flashing amber light. If CO levels climb above 99 ppm, the audible alarm and a flashing red light will be triggered. A RS-232 serial connection allows CO reporting and alerts to be displayed on a primary flight display (PFD), multi-function display (MFD), and also engine monitoring products, as well as the AERO 55 display unit.This Aero 455 Pulse Oximeter & CO Detector (EDMO# 455101001R) has a round faceplate.