5. Maintenance
If used frequently, the device, its keypad in particular, gets unavoidably dirty. Use a piece of soft cloth moistened with clean water to clean the device. You are recommended to follow the principles below while cleaning:
- Do not use aggressive detergents (such as abrasives or strong disinfectants).
- Clean the device in dry weather in order to make waste water evaporate quickly.
Warning
- Prevent water from getting inside the access unit.
- Do not use alcohol-based cleaners.