1.Especially suitable for enhanced 3D viewing experience. 2.It is safe for use and built to last. 3.Also convenient for outdoor use. 4.It serves as an excellent replacement for your old, damaged unit. 5.High-quality and cost-effective premium components from top manufacturers. Descriptions: 1.It is safe for use and built to last. 2.Also convenient for outdoor use. Product model: XH-A901 Input voltage: DC12-24V Number of channels: two channels Chip: Two NE5532 colour: blue Material: metal Size: 96 x 39 x 20MM Installation: 3MM Installation hole distance: 89.3 x 32.3MM Package Contents: 1 x XH-A901 NE5532 Tone Board 1 x 3P Audio cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement allowed error is +/- 1-3cm.