I always have the device connected to the mains, because in battery mode the illumination switches off after a short time. In power mode, the data is always readable. The power cable is included.
3 AAA batteries for the device and 2 AA for the outdoor sensor. I connect the device to power cable and don’t use any battery. The outdoor sensor with Alkaline battery usually works for about 6 months even at winter time.
Hello 'Rohrer Hans',
Thank you for your interest in our products. The outdoor transmitter is included in the scope of delivery. The following are the dimensions:
Base station: 210x26(60)x140 mm
Transmitter: 40x21x130mm
With kind regards
Your TFA Support