Assistive Technology Loan Library item === Two battery device adapters (also known as battery interrupters) are provided. There should be a sampling of different sizes in each box. These adapters are placed between the connection points in the battery compartment and provide a port for a switch connection. All of the battery-operated items in the Assistive Technology Loan library have already been permanently switch adapted or a battery adapter has been included. Use this battery device adapter trial if you would like to try these devices with your own toys or appliances. If you find these devices useful, the item is available from a variety of sources.