ITEM NAME:12V 2X18W 3CH Subwoofer TDA2030 2.1 Stereo Digital Audio Amplifier DIY Kits #gib Product Description Description: Features: The main channel: TDA2030A X 2 Power: 18W + 18W speakers with 4-6 inches, 4-8 ohms 15-50W full-range speaker Subwoofer: TDA2030A X 1 Power: When 30W, recommended to use 4-8 inches, 4-8ohms 20-60W subwoofer Voltage: AC 12V AC Dual ,recommended AC12V, power 30W2A above transformer. Output Impedance: 4-16 ohms. Cable: motherboard and pitch plate with 30CM long 6P cable connection. Amplifier board size: motherboard and fins total length 110mm, width 65mm, fins height 49mm Weight: approx. 113g Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Included: 1 x Digital Audio Amplifier Board.Subwoofer: TDA2030A X 1. Amplifier board size: motherboard and fins total length 110mm, width 65mm, fins height 49mm. Included: 1 x Digital Audio Amplifier Board. If item is defective after 3 months, you can still send it back to us.