The Voice Manipulator allows you to modify your voice and either send it to speakers or a Bluetooth-paired device. It allows you to apply a frequency shift to your voice and add an echo of variable volume and delay. The Voice Manipulator can be used in Direct Mode, in which the voice signal is sent to Line Out. It can also be used in Bluetooth mode, in which the output is sent via Bluetooth to a paired cellular phone, effectively allowing for the Voice Manipulator to be used as a Bluetooth headset