Specifications: No impact on current, high fidelity, no static noise. Small volume but strong power. There is no noise at all with 12V/5A or above 12V/50W transformer. The circuit board has a terminal which can be screwed by a screwdriver, quickly connect the wire. Type: Amplifier Board Voice Type: 2.0 Stereo Output Power: 15W + 15W Input Power: DC 8V - 18V/2000mA Frequency Response: 20Hz - 20KHz Matching Speakers: 4-8Ω, 10-80W, 3-8inch Loudspeaker Application: Bookcase Speakers, CRT TV, Radio, Small Power Amplifier, etc. Features: Stereo Voice, Dual Channel, Power Amplifier Size: 52mm x 48mm x 40mm(Approx.) Notes: Please place the power amplifier board in the position that without metal and other conductive objects to avoid short circuit and burn out the power amplifier board. It is necessary to check the connection of the components before power up, so as not to cause the power plate to burn out due to wiring errors. If you don't use it for a long time, please turn off the power of the amplifier. Please turn the power amplifier to the right volume to avoid damageing hearing for you and your family. 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 Amplifier Board