The Merlin 4i Energizer - Electric Fences has the following features; • 3.7 Joule output energy (single zone) • Robust and flexible design for home and commercial security • 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 • Powered by 230V mains and includes built-in battery for back-up power • Built-in gate alarm input to monitor if the gate is open or closed • Gate chime available to alert that the gate has been opened or closed • The fence voltage outputs can be adjusted using the keypad • The siren and gate outputs can be bypassed using the keypad