LA Crosse Technology V40A-PROV2 Complete Personal Remote Monitoring Weather Station User Manual STEP 1: POWER UP Insert batteries (in any order): 3-AA batteries into multi-sensor 2-AA batteries into thermo-hygro sensor 5 volt power cord (required) into V40A-PRO station *3-AA batteries for optional backup of your time and date *Battery operation only, station will not update …