The school should check the length of the warranty and find out exactly what is covered and, equally important, what is not covered. One-year warranties are common. Extended warranties and service contracts will probably be available. For some devices, the manufacturer suggests annual maintenance. School districts should weigh the cost of additional or extended warranties with the cost of the device. The manufacturer's warranty should be reviewed prior to purchasing an assistive technology device and before making any repairs or modifications to the device. In some case, warranties may be voided if persons other than the manufacturer or authorized service representatives attempt to repair a device.