Merlin Stealth M28S Dual Zone Electric Fence Energizer 8 Joule • 7.6 Joule output energy (two-zone) • Robust and flexible design for home, commercial and industrial security • Can be expanded into a multi-zone system • Built-in alarm monitors tampering or faults on the high voltage and earth fence wires • Connectable to armed response radio or GSM module • Lightning and power surge protection • Intelligent power saving to extend battery life • Easy-to-use tag included for controlling the energizer • Optional keypad for controlling and programming the energizer. This allows the user to control the energizer remotely, with up to four keypads • Powered by 240V mains and includes built-in battery for back-up power • Two built-in gate alarm inputs to monitor if the gates are open or closed