The ABox is a unique electrostim device designed specifically for erotic audio driven electro stimulation. Rather than just being sound triggered, the E-Stim Systems ABox is sound driven. The input, whether from the built in adjustable sensitivity microphone or the stereo input, is converted directly to a powerful but controllable Electro-Stim signal. Picking up sound from either a linked source such as a portable CD player, MP3 device (not supplied), or even the ambient environment via the internal microphone. It contains an instruction manual.