Behringer Powerplay P2 Personal In-ear Monitor Amplifier Features: Delivers crystal-clear, amplified audio directly to your in-ear monitors or headphones Built for instrumentalists and other performers who primarily play in a stationary position Smooth volume control is built to last a lifetime Rugged metal housing is engineered for superior durability Belt clip keeps the P2 anchored to your belt or strap Runs up to 12 hours on 2 AAA batteries (not included) 3.5mm output jack supports in-ear monitors, earbuds, and headphones Locking XLR input foils stage mishaps Stereo/mono source switch (internal)