Becker Centronic EasyControl EC411-III Notice De Montage Et D'utilisation page 31

You will find the appropriate battery type in the "Technical
data" chapter.
Only clean the device with a suitable cloth. Do not use aggressive cleaning
agents that may damage the surface.
Rated voltage
Battery type
Degree of protection
Permissible ambient temperature
Maximum emitted transmission output
Radio frequency
The maximum transmitter range on and in the building is up to 25 m, and up to
350 m in the open.
Changing batteries
Cleaning
Technical data
3 V DC
CR 2430
IP 20
-10 to +55°C
≤ 25 mW
868.3 MHz
31 - en