Introducing the all new BTstim Economy version Stereostim. It comes with 2 individual power controls, these are precision 10 turn Pots (they won't turn up too fast). It has one 3.5mm electrode jack for each of the 2 channels. The BTstim has a feel all it's own. Stop by our booth at any of the trade shows and conventions we attend to take it for a test drive. The unit comes with our One year warranty. *simple flip switch from off to on *plugs directly into any laptop, phone or tablet via the 3.5mm audio input jack. Accepts mp3 input. Comes with a CD including basic patterns similar to the ET-312. Note- not a standalone box, requires input from outside waveform generator, has no stored internal programs. Comes with: Power unit wall adapter 2 3.5mm wires for pins CD with basic wave patterns User manual (on CD) Note: this box ships separately from any other items ordered and isn't eligible for overnight it will come 2-3 day Priority. Separate tracking number will be provided. Please allow up to 7 days as these are hand-made. Control pulse, waveform, amplitude, intensity and more with software available online. Create and save your own programs for replay at a later date. Or download from databases of thousands of programs already created and uploaded by other users. Warning: This box is not for beginners. It has access to higher power levels than any other unit currently available with enough voltage to potentially cause serious harm if used unsafely. READ ALL INSTRUCTIONS prior to using! By purchasing this product, user agrees to assume all liability! For use as an adult novelty item only. Not intended to diagnose, cure, treat or prevent any disease. No medical claims warranted or implied by use of this product. Do not use if you are pregnant or have a pacemaker or other implanted medical device. Do not use on areas of swollen, broken, open or irritated skin. Do not use in bath or shower. Do not apply electrical contacts over the eyes, internally, or above the waistline. Read and follow all safety instructions. User assumes all liability!