Permit required. There is a $50 permit fee and the permit expires annually from issuance. There is also a 3 year permit option which is $125 and will expire 3 years from issuance.
Nassau County, New York Alarm Permit Alarm Permits
Send alarm permit request form and fee to address listed on application. Permit fee is $100 residential / $200 commercial. Permit is good for 2 years from issuance.