iproven Basal Body Thermometer for Fertility Tracking - Works with Apps - BBT-113Ai by iProven

Included Components : Spare battery Special Feature: High Accuracy Easily replace the battery in 4 steps — When the empty battery symbol is displayed, this is how you can replace it: open the cap

hold the battery case between your fingers and remove the battery with a needle

insert a new battery with the '-'sign facing up

put the cap back on.