In general, EAS labels can be applied to boxed merchandise, books, packaged and sealed merchandise, etc. The 8.2 MHz frequency (RF) and 58 KHz frequency (AM) are the most popular Electronic Article Surveillance (EAS) frequencies, which are used in the retail anti-theft industry to prevent shoplifting. Labels can be deactivated on the occasion of sales by a special-made deactivator. RF and AM labels are generally used in retail stores. EM labels are commonly used in book stores and libraries.