No, you can't view the temperature via your mobile phone or other devices, which I think is a shame. MfG. Macklemore

The batteries are included. The main unit has three AA batteries, the outdoor sensor two AA. The main unit should not be placed in the sun, otherwise the outdoor temperature will not be correct!

Hello IRA.1975 The display of the outdoor transmitter shows both the temperature and the humidity. Greetings Andy from Hama