Wifi frequency: 2.4GHz The caregiver call button only support 2.4GHz Wi-Fi. Choose Share Devices. SINGCALL Elderly Alarm Call Button System SINGCALL Alert Button for Elderly SINGCALL Alarm Pager SINGCALL Caregiver Pager SINGCALL Waterproof Caregiver Pager Wireless Range Indoors, the working distance of the calling system is 40m-150m (the distance between the pager and the tuya wifi receiver).