The F100 uses AAA batteries . If you plan to store the device for more than a month, remove the batteries to prevent corrosion.

: For group shots or distance photography, slide the remote out of its slot on the handle to use it wirelessly up to 10 meters (33 feet) away. 4. Troubleshooting and Maintenance Customer Questions & Answers - Amazon.com

: Remove batteries if the device will not be used for more than a month to prevent chemical leaks. Manual Access