The Leviton EVB40-P5T has an impressive pedigree. Leviton's advertising copy states that it's the "preferred choice of Toyota, Honda, Kia, and Ford plug in vehicles" (which suggests that these newer, more intelligent electric and hybrid vehicles have been doing some serious thinking about what brand of charger they want pumping electrons into their batteries) and that it's compatible with vehicles "with larger on-board chargers," which suggests that its power flow can keep up with the acceptance rate of newer batteries, i.e., the speed with which they can take in an electric charge. If the on-board charger on your shiny new Tesla is larger than 6.6kW, Leviton has you covered.
The batteries on electric vehicles (EVs) are getting larger and faster-charging all the time, especially with the push that Elon Musk has given them by placing a lot of his patents in the public domain. For anyone who's interested in protecting the environment by switching from carbon-emitting fossil fuels to potentially clean electric power, there are interesting times coming, though it should be noted that the reduction in carbon emissions that your electric car represents is dependent on what power sources your local supplier is drawing from off the electric grid. Coal-powered plants are still responsible for carbon emissions, and drawing off power that they've contributed to the grid doesn't necessarily zero out your carbon footprint. Your electricity will be cleaner if it's coming from hydroelectric or nuclear plants, though many people have their own fears regarding the latter. All things considered, though, electric is cleaner than internal combustion, and there are maps on the Internet that will show you how much of your power comes from which sources. And while steam-emitting hydrogen cars are on the horizon, don't expect them to become available (or affordable) any time soon.
The Leviton is a powerful 400 EV charger with a 25-foot cable that requires a 50-amp circuit to provide it with power. It may be just what your EV needs, though you should compare it first with some of the alternative chargers on the market, like the ClipperCreek LCS-20, the Siemens VersiCharge and the ChargePoint Home Hardwire.
This charger works great with a Tesla Model S (will max out a single charger), and is compatible with every other EV currently out there.
The 40 amps really reduces the charge time about 5 hours for a 41KW battery pack.
The absence of an on/off switch is certainly not a huge issue by any means, but it needs to be mentioned for completeness.