Producing the highest sound quality at all output levels, this mini-mixer has ultra-low noise operation and offers excellent audio performance. Distortion-free and easy to set up, it is perfect for quickly mixing up to 4 line-level signals without any complications. A separate volume control for each channel on the linear mixer provides individual input plugs and volume controls for each channel, and a single output from the amp. It mixes multiple channels into one track, perfect for your keyboard, small stage setup, drum kit. It is constructed of metal material. The length of this product is 10.8cm, the width is 7.5cm and the height is 3.1cm. Perfect for your keyboard, small stage setup, drum kit or submit. Item Name: Tuner Material: Metal Power Supply: DC 5V Features: Stable Signal, Excellent Audio Performance, Low Noise Size Details: L: 10.8cm/4.25", W: 7.5cm/2.95", H: 3.1cm/1.22" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Tuner 1 x US Standard Adapter 1 x User Manual