Four channels Wireless Smart Datalogger - Precision outdoor temperature ACCREDIA certifiable (PT1000 sensor, 30cm spaced from the surface: 0.25°C accuracy in whole range from -30°C to +50°C - 0.01 resolution) - Daily medium temperature, Degree days in accordance with DPR412 and real Degree Days related to a reference user-set temperature - Type “C” lithium internal battery for a battery life up to 10 years with samples every 10 minutes - IP65 sealing.