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Proper monitoring is essential for a great performance. With an XLR/jack combi input and 3.5mm minijack output, the SubZero Active Personal In-Ear Monitor Amplifier gives you high quality sound and volume control. Powered by regular AAA batteries, it can run for up to 12 hours, while the input is equipped with a locking latch to prevent disconnections during performances. Ideal for in-ear monitors and headphones.