Step n°1: Remove Check'In from its support
To remove Check'In from its support, remove the SafeStick from the middle slot to place it in the top slot of the Check'In.
You can use the tip of a paperclip or the tip of a pen to help you do this.
Step 2: Remove the batteries
Step 3: Insert new batteries
Pay attention to the polarity of the batteries!
The Check'In batteries are industrial quality LM17500 3V which allow a two-year autonomy.
Step 4: Put Check'In back on its support
To replace Check'In on its support, make the anchors of the support coincide with the holes located at the back of the Check'In.
Then slide Check'In down until it comes to a stop.
Finally put the SafeStick back in the middle slot.
After inserting new batteries, Check'In restarts and is operational again after a few seconds. You don't have to do anything else!
Don't forget to take used batteries to a collection point for recycling!