The T6713 is a compact CO2 sensor module designed for high-accuracy measurement of carbon dioxide concentration in indoor air quality and demand control ventilation applications. It employs Non-Dispersive Infrared (NDIR) technology with gold-plated optics and diffusion sampling, factory-calibrated to measure CO2 levels from 0 to 5000 ppm with accuracy of ±30 ppm ± 3% of reading (400–5000 ppm range). The module features Telaire's patented ABC Logic self-calibration algorithm, eliminating the need for recalibration in most applications and providing a lifetime calibration warranty. It offers flexible digital output options including I2C (up to 100 kHz), UART (19200 Baud with Modbus support), and PWM modes, operating from a 4.5–5.5 VDC power supply with typical average current of 20 mA. The compact dimensions (30 mm × 15.6 mm × 8.6 mm) and simple six-pin header interface enable straightforward integration into OEM products, making it ideal for HVAC systems, building automation, and energy-saving applications requiring reliable CO2 monitoring.