This model features a pigtail connection, making it a popular choice for standard mullion installations. The HID Signo 20 Reader is a slim mullion-style access control reader designed for narrow installations such as door frames and glass entryways. Supporting 125kHz, 13.56MHz, and mobile credentials, it provides reliable performance in a compact form factor. The Signo 20 is ideal for environments where space is limited but secure, modern access control is required.