Increase the security of your doors to the maximum. A useful bundle containing a security relay, tamper switch, and I/O module. The security relay is a simple accessory which prevents doors from being opened with a 12V battery. The tamper switch is designed to detect intrusion into the intercom’s frame and will activate an alarm if it detects intrusion. The tamper switch is designed to detect intrusion into the intercom’s frame and will activate an alarm if it detects intrusion.Individual bundle components may also be ordered individually.