Visonic GSM350-2 Quad Band Antenna (99-306395) When your burglar alarm goes off the reality is that in most situations it is ignored. Many people view the alarm siren as a nuisance and do not call the police or bother to investigate. The Visonic GSM350-2 Quad Band offers a solution without the need of a PSTN landline. The External Antenna can be used with a GSM-350-2, it offers enhanced GSM signal reception for locations that have poor network coverage.
