Stereo Audio Amplifier, Mini Digital Hi-Fi Bass Audio Subwoofer Amplifier, Product Details Specification: Jack input: standard stereo jack Input voltage: DC 12V Output power: RMS 2 x 20W 1KHz Frequency response: 20Hz - 20kHz Signal to noise ratio: 85 decibels High control: 12dB + / - 10KHz Bass control: 12dB 100Hz Signal level: 220MV 47K Material: Aluminum alloy casing Voltage: DC 12V 2A or more Port: 2.1 * 5.5mm Material: aluminum alloy Special features: supports USB, MP3, FM, SD, DVD Product size (length x width x height): about 12.50*7.00*4.00cm/4.92*2.76*1.57in Package size (length x width x height): about 13.00*10.00*4.50cm/5.12*3.94*1.77in Color: Blue, Red(optional) Package List: 1 * HY - 2001 Car Amplifier 1 * English User Manual ?Excellent quality and durability?Filtering and high-capacity power circuits. Power on/off control. CD DVD MP3 input. ?Powerful Function?Professional level input operational amplifier IC for circuit design, sound, transparent, bright. DC 12V power supply for cars and motorcycles. ?Multi-Device Support?Use high-power four-channel professional power amplifier integrated circuit, with low distortion and strong power.Four sound field modes of DSP. Two main channel outputs. ?Your Best Choice?Four electronic keyboard controls to help you operate the amplifier easily. Treble / bass / volume control. ?Quality Service?:If you have any questions about this product, you can contact us at any time. We have a professional customer service team and will provide you with the best quality service. We will try our best to solve your problem in time, please rest assured to buy. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.