80 mm (3.15 in.) square reader designed to mount directly to European and Asian size single-gang electrical back boxes. Typical maximum read range (Depending on local installation conditions) -ProxCard in. II card - up to 5.5 in. (14 cm) -ISOProx in. II card - up to 5 in. (12.5 cm) -DuoProx in. II card - up to 5 in. (12.5 cm) -ProxKey in. II keyfob - up to 2 in. (5 cm) -MicroProx in. Tag - up to 2.5 in. (6.2 cm) -ProxCard in. Plus card - up to 1.5 in. (3.7 cm) -Smart ISO/DuoProx in. cards - up to 2.5 in. (6.2 cm) -Proximity & MIFARE in. card - up to 5 in. (12.5 cm)