AcuRite 06003 PRO+ Upgrade for 5-in-1 Weather Sensor - 06003M Pro assembly upgrades the AcuRite 5-in-1 Weather Sensor (sold separately) Dual solar panels maximize sun exposure and allows internal aspirating fan to run more frequently Improves ambient temperature measurement throughout all hours of the day Easily installs onto any AcuRite 5-in-1 Weather Sensor; IMPORTANT: AcuRite PRO+ weather station models come with the upgrade already installed This upgrade should be used on 5-in-1 sensors that come with only one solar panel