Behringer Powerplay P1, In-Ear Monitor Amplifier, Wired in-ear system with volume control, Balance control, Mono or stereo mode switchable, Output impedance: 10 Ohm, Input: 2 XLR sockets, Power supply via 9V battery or power supply (both not included), Incl. peak limiter, Headphone output: mini jack, Metal belt clip, Mounting on microphone stand possible to 5/8"" or 3/8"" thread