Nemtek Merlin 4i Energizer The Merlin 4i includes a keypad for controlling and programming the energizer. The energizer can be installed near the fence and the keypad can be located where it is most convenient for the user. This allows the user to control the energizer remotely, with up to four keypads. 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