A security device and alarm system includes a reader preferably concealed in a fabric article, at least one tag, and an alarm unit. The reader includes a reader transmitter, reader receiver, CPU, power source, and power switch. The tag includes a tag transmitter and a tag receiver. If using active RFID tags, each tag includes a power source. The alarm unit includes an alarm receiver, alarm, and power source. If the reader receiver does not receive an appropriate reply from the tag transmitter after the reader transmitter sends a query to the tag receiver, or if the reader was deactivated, the reader transmitter sends an alarm signal to the alarm unit. Upon the alarm receiver's receipt of the alarm signal, the alarm is energized. If using multiple active RFID tags, the CPU checks for each through tag transmission identifiers, and the alarm identifies the missing tag through unique alarm signals.