Pack of Two: Two sets of 3-USB port chargers in each package. Get more products for less money. Ideal Choice: This is a surface mounted 12V car outlet charger that requires only a small hole to be drilled, no need to punch a big hole like most long-body products on the market. If your car or boat dashboard doesn't have enough space to install a long car charger, then this 12V USB socket will be ideal for you. How to Install: Surface mount, can be installed on a flat surface, just open a small hole, put the wire in, black wire connects to the negative terminal, red wire connects to the positive terminal, screw on the two screws and put on the cover. Dual PD3.0 and QC 3.0 Independent Output: 12V USB socket is designed with Dual USB-C PD 3.0 port and USB-A QC 3.0 port. Input voltage: DC12-24V, USB-A output: 5V=3A, 9V=2A, 12V=1.5A (18W Max), USB-C output: 5V=3A, 9V=3A, 12V=2.5A (30W Max), the total power of the three ports can be up to 78W simultaneously. Individual Non-slip Sw