An alarm apparatus attached to an electronic device, activated by unplugging AC power cord of the apparatus device from a power outlet, irrespective to the states of the main switch and the device switch. The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore\u2014by size separation\u2014and H2SO4, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP. A number of signal channels are formed between the mating contacts and the terminals with the inductance electrically connected therein.