warm remind:<br />this product would be deliveried tofrom california ・while to other countrieschinese .<br /><br />features:<br />- compact design and practical function・ perfect for travel daily use・ convenient and easy to use<br />- input voltage: dc 12v/24v; output: dc 5v 4.2a. ・ combined dual usb power socket with blue/red led light voltmeter・ fit in your car switch panel・ great for charging and voltage checking<br />- works great with smart technology・ over-heated・ over-current・ over-charging protection. charging will be automatically stop when battery is full・ your guarantee of safety<br />- compact design and practical function・ high quality environmental abs material・ can run multiple accessories at one time・ convenient and easy to use and install<br />- compatible: popular devices usb 2.0 charging mobile phones or other electronic products・ such as vehicle・gps・ mobile phone・ camera・ mp3<br />- blue led digital voltmeter・ can easily monitor the storage-battery voltage<br /><br />specifications:<br />condition: 100% <br />voltmeter display color: blue・red<br />dimension l*w*h: 1.97 x 0.96 x 1.97 inches<br />power input: dc 12v-24v usb socket power output: dc 5v 4.2a<br />net weight: 0.04lb<br />package include:<br />1 x dual usb charger  voltmeter