I just bought my first Estim setup and tried it once … WOW!
I bought a Coyote power box, but heard its plugs were low quality, so bought an E-stim systems Moaner plug electrode. Bought a bunch of cheap adapters and connectors from Happystim-USA and Amazon, because I had zero experience. Read the estim Reddit and this forum, and gave it a go with two tens pads on various locations on dick and balls, and Moaner up my coal chute.
Amazing sensations even with stock patterns on the Coyote. Only went up to strength 32 on either channel, but I experienced the Moaner ghost fucking my asshole while the Tens pads stroked my rod like a cheerleader squad. Could have gone for hours more!
Tonight is session #2, and I have orders in for more electrodes. Coupled with prostate play separately, this is nirvana. Got a new enema setup (also a noob here) to punish this naughty boy!
If you want to try estim cheaply, a Tens 7000 power box is only $30 on Amazon, comes with the initial wires you need, and just get a pack of Tens pads for $10. You're out only $40. Tens is used by athletes and those injured, it's unofficial use is for your nether regions. Just learn and follow all safety tips. Try it!
Better quality and more power from Estim Systems or Electrastim or Erostek. Coyote is a mid-grade option, but does have Bluetooth support and phone app. Gary at Happystim online is great and can assist you shopping.