Swann window & door magnetic alarm. Model number: SW351-MD2. Brand new in package. Help protect your home from potential intruders with the Swann Window and Door Magnetic Alarms, which sounds a siren when the two panels are separated. These are compact and discreet, and can be turned off easily using the concealed on/off switch. Magnetic Alarm Features: Simple installation with self-adhesive pads, On/off switch concealed under panel, 110dB volume & Siren sounds when panels are separated.