Behringer Powerplay P2, Headphone amplifier, Very compact headphone amplifier for in-ear monitoring, XLR and jack input (combined, lockable), 3.5 mm Mini-jack jack for earphones, Built-in stereo / mono source switch, Volume control with on / off switch, Operation up to 12 hours with 2 AAA batteries or rechargeable batteries (not included, suitable batteries: Article Nr. #417474#), Dimensions (H x W x D): 33 x 38 x 132 mm, Weight: 0.140 kg, Includes belt clip