Features: In-ear monitor amplifier designed for personal monitor applications. With dual XLR inputs, allow for 2-channel mono or stereo operation. Switchable stereo/mono operation with mix function. With VOLUME and BALANCE control knobs. With 3.5mm headphones output, and integrated current limit protects your ears and headphones. Specifications: Material: Metal Power Supply: DC 9V power adapter or 9V battery (both are not included) Item Size: 8.8 * 10 * 3.5cm / 3.5 * 3.9 * 1.4in Item weight: 242g / 8.5oz Package Size: 23.5 * 16 * 8cm / 9.3 * 6.3 * 3.1in Package Weight: 435g / 15.4oz Package List: 1 * Amplifier 1 * Metal Clip 1 * Mounting Adapter 1 * Screw 1 * Users' Manual(English)