Description The item is a portable and practical waterproof DC to DC power supply converter module, which makes use of imported integrated switch ultra-thin regulator module manufacturing process and synchronous rectification technology so as the conversion rate is more than 96%, what&39;s more, calorific value is extremely low. It can be used for converte DC 12V to DC 5V, and for LED car display, GPS, MP3, MP4 car DVD, hard disk player and the stereo. Features - Color: mainly black.- Material: durable hard plastic and copper wire.- Size: about 46.2 x 26.7 x 13.6 mm.- Cable length: about 30mm.- Input: DC 12V (8V-22V), Output: DC 5V /3V. Power: 15W.- and DC 12V to 5V 3A 15W Dual USB Female Port Power Adapter Converter Module.- Make use of imported integrated switch ultra-thin regulator module manufacturing process and synchronous rectification technology so as the conversion rate is more than 96%, what&39;s more, calorific value is extremely low.- Over current protection, over temperature protection, short circuit protection are available.- Low power consumption with high conversion efficiency.- Application: It can be used for LED car display, GPS, MP3, MP4 car DVD, hard disk player and the stereo.- Waterproof housing, easy to install and carry.- Note: It can&39;t be used for iPhone, iPod, Tablet GPS navigation, Tachograph, USB speakers.Packing list: 1 * Waterproof DC 12V to 5V 3A 15W Dual USB Female Port Power Adapter Converter Module (Black)