RedRock® RR122-1A2x-51x TMR Magnetic Switch Sensor Coto Technology RedRock® RR122-1A2x-51x Digital TMR Magnetic Switch Sensors are suited to the demands of next-generation metering, security, automotive, instrumentation, medical, industrial, or any application requiring a magnet and sensor. These sensors feature ultra-low power, which is especially important in battery-powered applications, miniature size, high sensitivity, and availability. Coto Technology RR122-1A2x-51x Sensors are a popular alternative to Hall Effect sensors and Reed Switches.