There are various varieties of zappers on the market. Each has different frequencies and some models may offer additional options and features; more advanced models often cost more than their less advanced counterparts. Most models can be safely used by people with pacemakers as well as pregnant women. They are also safe for use by children when placed out of reach of curious toddlers.<\/p>\n
Frequency of the Zapper Is Key Certain parasites and bacteria react to certain frequencies; most zappers produce square wave output with odd harmonics extending into the megahertz range where parasites thrive; wrist straps and cords included with some zappers are often made of high resistance wire (1 megohm) that drain most of its voltage, rendering the device ineffective – look out for low resistance cords\/straps when purchasing a zapper!<\/p>\n