An alarm unit for monitoring or detecting presence of an analyte on a separate sensor portion. The present invention comprises only the alarm unit and its means for attachment to a user's clothing. A square plastic casing protects the alarm electronics portion including a signal processing means. A large clip attachment means is included that is easily separated and attached from the casing and is used to attach the unit to clothing and which has enough clearance to be used with thick articles of clothing including diapers and which has a set of teeth frictionally held against a rubber strip portion located on the casing back so as to also enable secure attachment to very thin articles of clothing. A three-way switch is located externally for easy alarm chime and alarm volume selection. Interdependent modes of operation enable the signal processing means to control the alarm unit operation and features including low power indication, improper cable plug installment, three-way switch deactivation during Monitor mode, and a snooze/reset feature by which the alarm is easily disabled temporarily so that, as an example, a user can focus on running to the bathroom where the device is used to treat enuresis.