ErosTek ET-312 is basically the Cadillac of estim machines.
There are other units out there even some that can be DIY, you might look at
https://www.smartstim.com/ for help. The forums there contain many many reviews of the various machines.
I connect mine via a Bluetooth v4 audio player, my video player lets me override the bt-headphone out and keep it running on the main sound, so i can run a tease in a small monitor and movies on the main if I so choose.
at the very lease you need a tri-phase adapter, a few cords, and some tens pads (
https://amzn.to/39BAiKF) I've done quite a few runs with the tri-phase common at the base of the cock, and the two hots one on the tip and one on the balls. I cut the sides off the tip trode to get a 1/2" x 1/2" pad to make the tip stronger"
there are plenty of other accessories out there, conductive rubber rings, insertables for boy and girl parts, and enough butt plugs to satisfy anyone.
if you get into estim you can go beyond the teases too, there are quite a few audio files that let you run the cock hero movies to estim, and a converter for realtouchscripts.com scripts to allow you to estim in time with a variety of video files.
https://www.btstim.com/product-page/btstim-econo is cheaper than the 2b, but you will either need a cable from the computer, or grab a bt v4 or v5 from amazon I use an older version of this
https://amzn.to/3cG0O7H.
Other versions on btstim have built in mp3 players and bt receivers I think.
