S1 is a personal in-ear monitor headphone amplifier that can be used or in the studio, to provide performers and recording artists with a flexible, convenient personal monitoring solution. The dual XLR inputs allow 2-channel, mono or stereo operation with a convenient mix function which allows you to run two sources into the S1. Two simple controls,Level and Balance, help you achieve the perfect mix in an instant. Intended for drummers and other performers, the unit features a high-power headphone output that helps to that as the band gets louder, you'll still be to hear your performance. SPECIFICATIONS: High-powered headphone output with limiter protects your ears; loud enough for drummers Level and Balance/Mix controls Controls for Level and Balance S1 Personal In-Ear Monitor Headphone Amplifier for drummers keyboardist guitar player vocalist bass player Every Musicians that is not moving around the stage can use it. Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. size: 11.5 x 7.5 x 3.5cm Material:ABS colour:Black Voltage: AC100-240V Package Contents: 1 x Headphone Amplifier 1 adaptor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.