The QEL-L option comes standard with an RX switch to monitor the push pad of the exit device.
With the standard QEL option, the push pad retracts every time the motor is engaged, so an RX switch would also change state.
With the QEL-L option, the push pad is not retracted when the motor retracts the latch, so the RX switch will only change states when the pad is manually depressed.
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