"Smart Ring" fitness wearable (Highway SL6)

For technical detail, see photo of box. Box also says that finish is silver (as in stainless steel), and size 8.
I tried it out, though it does not fit my boney fingers. It connects OK to my Android phone but I could not get any display of biological measurements. Not sure about "standby" of 10-15 days; 5 days seems more likely...