Feature: 1. DETECTABLE INDICATORS: The carbon dioxide monitor combines sensors to monitor carbon dioxide (CO2), temperature and humidity in real time and display on a screen 2. BATTERY INFORMATION: The carbon dioxide detector has a 2000mAh large capacity built in lithium battery, 5V micro USB charging, and support low battery warning 3. ACCURATE AND FAST: The carbon dioxide monitor provide accurate monitoring, real time change, and sampling time of 1.5 seconds, making it a safe air environment for you 4. PORTABLE SIZE: The air quality monitor has 190x80x52mm size, small and portable, easy for RV travel, outdoor activities handheld use 5. EXCELLENT PERFORMANCE: CO2 temp humidity sensor is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stability Specification: Item Type: Carbon Dioxide Detector Atmospheric Pressure: 86KPA-106KZ Carbon Dioxide Detection Method: Infrared(NDIR) Sampling Time: 1.5 Seconds Detection Temperature: -10℃ to 50℃ Relative Humidity: 20%-85 Storage Temperature: -10℃ to 60℃ Carbon Dioxide Concentration Unit: PPM Battery: 1 x Rechargeable lithium battery 2000mAh Power: Charge 5V DC power via micro USB port Size: Approx. 190 x 80 x 52mm / 7.48 x 3.15 x 2.05in. Package List: 1 x Carbon Dioxide Detector1 x USB Cable1 x User Manual