The Zapper Digital is more powerful than the Gamma Zapper. The Gamma Zapper is powered by a 2 x 1.5 volts AA producing about 0.3 Amp, Zapper Digital is powered by the 16 volt MED Adapter at 4.5 AMP, The Gamma Zapper cannot be programmed, however the Zapper Digital can, and comes with a frequency book listing 3500 different conditions. The list goes no and on. there really is no comparison.
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