The Submarine can be used on both. (but not on guitars with nylon strings)
Place the Submarine under the top or bottom strings. The signal from just these two strings can then be sent to effects.
The Submarine comes supplied with a cable. which can then be used with regular guitar leads. The velcro tie can be used to secure the lead to a strap or end-pin cable.
Submarine in one; regular guitar sound in the other.
Works well with smaller amps
For the best results using octave down bass effect a separate bass amp should be used
Use a Boss Line Selector or similar to blend two signals into one input
Simply DI the Submarine as you would any other instrument.