The excerpt below is directly from the Canon DR-S150 document scanner Setup Guide:

About the radio waves
This device operates in the 2.4 GHz frequency band (2.400 to 2.4835 GHz). Other users of these frequencies include products such as microwave ovens, scientific and medical devices, similar Wi-Fi stations, wireless intercom radio equipment for mobile device identification used in industrial production lines (requiring licensing), specific low-power
radio stations that do not require licenses, amateur radio stations and others (all afterwards called “other stations”).

When using, be aware of the following.

1. Before using this device, check whether other stations are operating.
2. If radio frequency interference occurs between this device and other stations, immediately relocate the device or stop using it (stop transmitting).
   After stopping, consult with your retailer or with our sales staff regarding measures to avoid interference (e.g., partitioned installation).
3. Otherwise, if troubles occur from radio frequency interference by this device to other stations, consult with your
   retailer or our sales staff.