Bresser Sensor - CO2 Sensor - compatible with weather stations 7003700 and 7003240. Bring a breath of fresh air into your home, office, and more at the right time - with the Bresser CO2 Sensor. Because we all need healthy indoor air with sufficient oxygen to feel good and stay productive. That's why one thing is very important: regular ventilation. You can see when it's time by checking the integrated display of the CO2 monitor: there you will see the carbon dioxide level and the current air quality status. But as an extension for a compatible Bresser weather station (not included), the sensor also provides a clear picture. The connection is established immediately - and you always have the CO2 level displayed on the screen. A standalone solution or a smart expansion for your weather station - ensure optimal fresh air supply with the Bresser CO2 Sensor. The sensor is compatible with weather stations with the following item numbers: 7003700 and 7003240 (you can find the item number on your device and packaging). Features: Wireless CO2 sensor, 3x AA rechargeable batteries, 1.2 V (included), 4 channels available: approx. 150 m. Dimensions: 82 x 120.5 x 41 mm (L x W x H).