(1) Current expense emergency reserve account. The funds in the reserve shall be used to finance unanticipated general fund current expense costs required for a thorough and efficient education, or to finance school security improvements, including improvements to school facilities. The account shall not exceed $250,000 or one percent of the district's general fund budget up to a maximum of $1,000,000, whichever is greater. A board of education may appropriate funds to establish or supplement the reserve in the district's annual budget or through a transfer by board resolution at year end of any unanticipated revenue and unexpended line-item appropriation amounts. Withdrawals from the reserve may be made at any time and shall require the approval of the commissioner unless the withdrawal is necessary to meet an increase in total health care costs in excess of four percent, or the withdrawal is included in the original budget certified for taxes to finance school security improvements, including improvements to school facilities. As used in this paragraph, "school security improvements" means school security improvements, including improvements to school facilities, which are limited to safety and security measures involving building monitoring and communication technology designed to address school crime and the safety of students, staff, and visitors to school facilities. School security improvements may include, but need not be limited to: security cameras to monitor the school; an electronic notification system that automatically notifies parents in case of a school-wide emergency; an automatic door locking system for access control; and a badge system for school employees.