1.Especially suitable for watching in 3D effect is stronger. 2.It is safe to use, . 3. and portable to taken outside. 4.It is the best replacement for your old,broken one. 5.High-quality and cost-effective exquisite components from leading manufacturers. Descriptions: 1.It is safe to use, . 2. and portable to taken outside. 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 aperture: 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.