Three channels Wireless Smart Datalogger - Indoor temperature, relative humidity and CO₂ concentration (temperature accuracy: 0.2°C from 0 to 50°C range - resolution: 0.01°C - relative humidity: ±2,5% at 25°C, 0-90% RH – CO₂: 0-5,000ppm range, accuracy < ± 50ppm +3% of the acquired value) - Type "C" lithium internal battery for a battery life up to 4 years with samples every 60 minutes.