The Signo 20 and Signo 40 card readers are HID’s newest, most secure readers. They’re both part of the brand’s signature line of access control readers and we’re often asked about the differences between the 2.
The main difference between HID Signo 20 and 40 readers is the sizing and mounting options. Signo 20 readers are suitable for mullion-style mounting, whereas Signo 40 readers are bigger and suited to wall switch mounting.