I bought this to supplement the outlets (12 volt and USB) in my 2013 Silverado. The 2 amp USB will maintain my Nexus 7 tablet which I use for GPS. It will only charge it if the tablet is turned off. The 1 amp USB will maintain Samsung Galaxy S3 and S4 smartphones, but will not charge them unless they are turned off. Mounts unobtrusively near bottom of dash, I have mine hard-wired into vehicle for permanent use. CLA sockets are a bit shallow, so CLA adaptors can be easily dislodged by a rambunctious lab in the front seat. Covers for the CLA sockets are nice addition.