Specially designed USB power supply is compatible with most of the products operated by USB power in the market. This HiTech wall mounted USB charger is operated by 12V or 24V. So this can be used for trucks and busses too. This is very easy to use and install. Specifications: Input : DC – 24V Output: 5V3.1A White Color Optional Blue Light Customer Service： All products are under high product safety surveillance and no faulty products are allowed to reach the consumer. However, in case if you encounter any inconveniences please do not hesitate to directly contact us for an immediate solution. Thank You