The both DOTs go on smart phones.
The smartDOTs can be broken up and used for specific applications as follows:
Use the gold wi-fiDOT™ for:
Cordless phones - place on base station / sending unit
Baby monitors - place on base station / sending unit
Use the silver electroDOT™ for devices without Wi-Fi:
Cordless phones - place on handset / receiving unit
Baby monitors - place on receiving unit / speaker