Feature 1Direct connection via CD changer port with CD sound. 2Control music files from your car radio panel or steering wheel. 3Support USB flash, SD Card and 3.5mm jack input. 4Building in high MP3/WMA decoder. 5No signal interfere, no battery required. 6Building in high MP3/WMA decoder. Building in amplifier chips. 7No signal interfere, no battery required. Smart design and easy to install and use.Features: Direct connection via CD changer port with CD sound. Control music files from your car radio panel or steering wheel. Support USB flash, SD Card and 3.5mm jack input. Building in high MP3/WMA decoder. Building in amplifier chips. No signal interfere, no battery required. Smart design and easy to install and use. Specifications: Item type: Cables, adapters & sockets Voltage input: DC 12V Signal-to-noise: 95DB Max. current: 200mA Frequency response: 20HZ-20KHZ Working temperature: -10-80 Celsius degree Certificate: CE & RoHS Item weight: Approx. 130g / 4.6oz Package size: 15 * 10 * 4cm / 5.9 * 3.9 * 1.6in Package weight: Approx. 175g / 6.2oz Package List: 1 * USB Car Adapter 1 * Card Reader 1 * User Manual Compatible with: For Mazda series For 1999-2003 Mazda 323 For 2003-2006 B-Series Pickup For 2006-2011 CX7 (see note 1) For 2003-2011 Mazda 3 For 2005-2011 Mazda 5 For 2003-2008 Miata/MX5 For 2002-2006 Mazdaspd. For 2002-2011 MPV For 2002-2008 Protege For 2003-2006 Tribute Note: Not compatible with navigation radios.Package List1 * USB Car Adapter 1 * Card Reader 1 * User Manual Compatible with: For Mazda series For 1999-2003 Mazda 323 For 2003-2006 B-Series Pickup For 2006-2011 CX7 (see note 1) For 2003-2011 Mazda 3 For 2005-2011 Mazda 5 For 2003-2008 Miata/MX5 For 2002-2006 Mazdaspd. For 2002-2011 MPV For 2002-2008 Protege For 2003-2006 Tribute