Sensormatic Security Barcode Labels58 KHz Frequency Security System Product Description: The 58 KHz Frequency Security System is designed specifically for use with metal or metallic items. Unlike traditional RF frequency systems, which can be blocked by metal, the 58 KHz frequency penetrates metal surfaces, making it ideal for securing products in department stores that sell a wide variety of items, including electronics, appliances, and other metal based goods. Key Features: Metal