Very good question and I am glad that you asked. BTW, I like the Spooky-2 unit. It is a good value for the money but,
Can you use the Spooky-2 in your car? Can you take it to the office, can you use it in the jungles of Africa? Or in the swamps of Florida? Can you ride a bicycle or motor cycle when using the Spooky-2? Can you jog with it?
Also, does Spooky-2 come with a 4 point contact system, 3 points positive?
The ParaZapper MY-3 has preset modes that you just turn on, select, and use. No need to program or select individual frequencies ( except that you might want to in a couple of cases ).