The PC4020 provides 16 zones on the main control panel; it is expandable using hardwire, wireless modules and addressable zones. The technology allows two addressable loops for up to 112 addressable devices as well as 16 LCD keypads per system, eight partitions, 1,500 user codes (four or six digit), 3,000-event buffer, nine account and three phone numbers. The control panel has one supervised bell zone, and a PC link for local uploading and downloading to go with the remote uploading and downloading via DLS-3 software. It has a supervised digital-alarm communicator and space for two 7Ah lead-acid rechargeable batteries.