Wall switch sized prox reader. Dimensions: 4.7 in. x 3.0 in. x 0.68 in. (11.9 x 7.6 x 1.7 cm). 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. (12.7 cm) -DuoProx in. II card - up to 5 in. (12.7 cm) -Smart ISO/DuoProx in. cards - up to 5 in. (12.7 cm) -Proximity & MIFARE in. card - up to 5 in. (12.7 cm) -ProxCard in. Plus card - up to 1.5 in. (3.8 cm) -ProxKey in. II keyfob - up to 2 in. (5.1 cm) -Microprox in. Tag - up to 3 in. (7.6 cm)