Anti-theft security device and perimeter detection system

A security tag comprising:

• a housing;
• a connecting portion connected to the housing and operable to connect the housing to merchandise to be secured;
• a monitoring device operable to monitor whether a party removes or attempts to remove the housing from the connecting portion;
• and
• an alarm operable to emit a tamper signal when the monitoring device indicates that a party has removed or attempted to remove the housing from the connecting portion in an unauthorized condition.

A security system comprising:

• a security tag operable for connection to merchandise to be secured;
• a monitoring device operable to monitor whether a party removes or attempts to remove the security tag from the merchandise;
• and
• an alarm operable to emit a tamper signal when the monitoring device indicates that a party has removed or attempted to remove the security tag from the merchandise in an unauthorized condition.

A security system comprising:

• a security tag operable for connection to merchandise to be secured, wherein the security tag includes a first element operatively connected to a second element;
• a monitoring device operable to monitor a relationship between the first element and the second element;
• and
• an alarm operable to emit a first alarm signal when the monitoring device indicates that the first element is separated from the second element in an unauthorized condition.

A security system comprising:

• a security tag operable for connection to merchandise to be secured, wherein the security tag includes a first element operatively connected to a second element;
• a monitoring device operable to monitor a relationship between the first element and the second element;
• an alarm operable to emit a first alarm signal when the monitoring device indicates that the first element is separated from the second element in an unauthorized condition;
• a plurality of network readers positioned in predetermined locations, wherein each network reader has a predefined reception range and each network reader is operable to receive wireless signals including the first alarm signal;
• and
• a collector connected to each network reader of the plurality of network readers and operable to receive information from the network readers regarding wireless signals received by the network readers for security processing.