Keri Systems Keri Systems NXT-3R Proximity Reader for NXT Controllers, Card and Tag, 4-Conductor, 10 to 14 Volt DC at 110 Milliampere Typical, Up to 4" Read Range, Black, Entry/Access Version, For Doorframe/Mullion Mount MSRP: Was: Now: $119.75
Keri Systems Keri Systems MS3000X MircoStar Proximity Reader, Standard Audio Tone, 12 Volt DC, 50 Milliampere, 125 Kilohertz Excitation, Black, For Doorframe/Mullion MSRP: Was: Now: $175.75