1. Not enough wattage
2. Playing Music could be painful. You use StereoStim - a mini-program with specific built frequencies to do different things.
3. You need an input and output type of amp.
The most common that people use are Old PC speakers - small, self amplified and small enough to not do damage to get you used to the Estim.
Most of the folks seem to be happy with the beginners kit. Because I'm also a beginner - Im staying small, and experimenting lightly.
This isn't like your applying 70V+ or 20A to your dick..... Small voltage LOW current. This is basically just a poor mans version of a TENS unit.
A unit that is recognized by the medical community to stimulate muscles.
Many prescribed TENS units are MUCH stronger than the StereoStim unit.
Again - poor mans version to get you accustomed to it.
Remember...it isn't the voltage that can kill you - It's the Current.