I've been using this for about a year, and it now needs to be charged every day. I'm selling it because my health has improved and I no longer need it. To accurately measure your data, I recommend trying the official sizing kit or something similar to determine the correct ring size. Please understand that this is a junk item before purchasing. Please refrain from purchasing if you are sensitive to this. The only included accessory is the charging dock. Please check the photos for details.