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Jaguar Activity Key | 2017 Autoblog Technology of the Year Finalist

In principle, the Jaguar Activity Key is a good idea. It's simple, useful, and relatively inexpensive. Unfortunately, in our testing it was less than reliable. Here's how it's supposed to work: To lock the car, leave your keys and fobs inside the vehicle, and strap the band on your wrist. Then, within 30 seconds, place your banded wrist against the letter J of the Jaguar script on the back tailgate. When you come back, you can unlock the vehicle by pressing the tailgate opening button, then, again within 30 seconds, placing the Activity Key band against the J of the Jaguar script. We chose the Jaguar Activity Key as a finalist for our 2017 Tech of the Year award because it's an uncomplicated device with lots of potential customers. Jaguar says the wristband is "robust and fully waterproof." Swimmers, surfers, kayakers, hikers, and even couples out for a sunny-day picnic could use a feature like this wristband key. Plus, wearables are pretty new as a category in general, and even more so in the automotive space. We didn't go skydiving with it or anything (an activity Jaguar cites as a potential usage case), but we did dunk it in water with no ill effects. While it all sounds good in theory, actually getting the Activity Key to work effectively was unexpectedly difficult, especially when the cameras were rolling. We tried varying the timing between closing the door and using the wristband, as well as between using the tailgate button and the wristband. It worked about half the time, regardless of our process or who was wearing the wristband. Whether our issues with the wristband were due to interference, new-technology teething problems, or just electrical gremlins, the idea of purposely locking the keys inside an automobile without having a foolproof way to unlock it gives us reason to pause. The Activity Key is a $400 standalone option on the 2017 Jaguar F-Pace, but only on Prestige, R-Sport and S models. The least expensive F-Pace with Activity Key costs $51,095.

Weekly Recap: Automakers rethink the definition of luxury

Variety is the spice of life, but it's becoming a prerequisite for luxury carmakers in the ultra-competitive US market. The Detroit Auto Show was strong evidence of this reality. It's not enough to offer attractive and well-appointed cars and SUVs anymore. Luxury brands that want to be competitive need to invest in everything from high-powered supercars to clever hybrids. To be relevant, you need to be green and mean – and everything in between. As General Motors product chief Mark Reuss said after the reveal of the 640-horsepower Cadillac CTS-V: "We are not leaving anything on the table." He was speaking for Cadillac, but he might as well have been speaking for the luxury car market. The CTS-V debuted in Detroit about an hour after Lexus surprised showgoers with the reveal of the RC F GT3 race car and then announced ambitious plans to return to competitive racing. That almost overshadowed the fact Lexus had just revealed another potent addition to its growing F line, the 467-hp GS F. View 20 Photos But for luxury brands, it's not just about maximum horsepower for well-heeled enthusiasts or decadent amenities for the Grey Poupon set. Strong competition from all corners has forced automakers to refine and expand their lineups in ways unforeseen even a few years ago. Case in point: Mercedes-Benz finally has an answer to the BMW X6, rolling out the GLE coupe in Detroit. The X6, which blends coupe-like styling cues with some of the functionality of an SUV, debuted in 2008. Back then it was a punchline, but seven years and more than 260,000 sales later, the X6's success has compelled Benz to respond. Mercedes – one of the strongest proponents of diesel technology – also debuted the C350 plug-in hybrid sedan, which promises a range of 20 miles on electricity, though fuel economy figures were not announced. The car pairs Mercedes' well-received 208-hp turbocharged four-cylinder with an electric motor for total output of 275 hp and 443 pound-feet of torque. Meanwhile, Infiniti will add the Q30 hatchback to its lineup by the end of the year, new president Roland Kruger reiterated in Detroit. It's expected to be joined by a crossover variant, and the additions will help strengthen Infiniti in the United States and abroad. "While we're expanding our product line, we're also expanding our market reach," he said. That's something echoed by Jaguar executives, who are preparing to launch the brand's first crossover, the F-Pace, in 2016.

Watch the Jaguar I-Pace live reveal

The day has finally come for the Jaguar I-Pace electric crossover to be revealed, and you can watch as the sheet is pulled off the company's first full EV. The reveal starts at 1:00 p.m. ET, and can be viewed in the embedded video above. The I-Pace was first revealed in concept form in Nov. 2016. Jaguar claimed it had a range of 220 miles, 400 horsepower, and 516 pound-feet of torque. Jaguar has also promised very fast charging at 100kW DC chargers. Apparently it can regain 80% of its charge in 45 minutes at such a charger. Jaguar has claimed this charging capability for the production model, but we have yet to see if the power and range numbers held up. Jaguar will also run a one-make I-Pace race series alongside Formula E. We'll see if any further announcements are made about the racing version of the car and the series. Related Video: