Long read range distance (up to 8 in. with ProxPass). Dimensions: 12.0 in. x 12.0 in. x 1.0 in. (30.5 x 30.5 x 2.54 cm). Autotune allows read range to be maintained within four inches of metal. Wiegand, Clock-and-Data, RS-232, RS-422, and RS-485 output modes are configurable. Power requirements: 12 or 24 VDC (configurable). Charcoal Grey color only. Typical maximum read range:(Depending on local installation conditions) ProxCard in. II card - up to 24 in. (60.9 cm) ISOProx in. II card - up to 20 in. (50.8 cm) DuoProx II Card - up to 20 in. (50.8 cm) Smart ISOProx in. II - up to 20 in. (50.8 cm) Smart DuoProx II Card - up to 20 in. (50.8 cm) HID Proximity & MIFARE in. Card - up to 20 in. (50.8 cm) ProxCard in. Plus card - up to 13 in. (33 cm) ProxKey in. II keyfob - up to 17 in. (43.2 cm) Microprox Tag - up to 15 in. (38 cm) ProxPass Active Vehicle Tag - up to 8 in. (2.5 m)