DKS 1815-217 DKS 20 Prox Card Reader is designed for secure access control. Has advanced security features, is weather-resistant, and compatible with various proximity card formats. Tamper detection capabilities and customizable LED indicators. Read ranges are not absolute and will vary depending on several factors including where the reader is mounted, the mounting surface and product application. Active tags (DKS 150, DKS 200) will provide an increased read range. Up to a 4-inch read range.