Ideal for amplifiers and other devices with only one microphone input. This mixer allows you to connect three microphones. This mixer does not require a power supply. Includes two dynamic microphones and a simple mixer. Convenient when you only have one microphone input. This is a simple passive mixer set that allows you to connect three microphones. - Model: 2 microphone set - Connection Box: Includes a microphone connection box - Switch: Microphones have switches - Output: To the AMP's microphone input Since it's a set of two microphones, the simple mixer can accommodate one more microphone. The microphone mixer is unused. Returns are not accepted to prevent parts removal or exchange. Thank you for viewing.