This fun video personifies the prowl for Wi-Fi. You could pay the password-pimp for a fast connection, but what about that loose hotspot? Jumping on free Wi-Fi is easy, but only while it lasts, and you gotta watch for viruses:
Era energiei fără fire a făcut un pas înainte susţin cercetătorii, care cred că aparatele electrocasnice şi telefoanele mobile vor putea fi alimentate cu energie fără a mai fi nevoie de fire şi cabluri. Specialiştii spun că acest lucru ar fi posibil folosind doar principii simple ale fizicii.
Electricitatea wireless poate fi obţinută prin “rezonanţă electromagnetică” un fenomen fizic în care obiectele cu aceeaşi frecvenţă de rezonanţă pot efectua transferuri de energie între ele, fără să fie nevoie de un impact cu un alt obiect.
Cercetarea în domeniul electricităţii wireless a început în urmă cu câţiva ani şi a avut ca sursă de inspiraţie munca unui grup de oameni de ştiinţă de la Massachusetts Institute of Technology. In 2008, Intel a dezvăluit câteva dintre soluţiile sale în ceea ce priveşte energia wireless, iar anul acesta în cadrul Consumer Electronics Show, desfăşurat în Las Vegas, mai mulţi producători participanţi la eveniment au dezvăluit câteva dispozitive de reîncărcare wire-free.
But the design is only part of why you're paying $130—it's to make you feel good about dropping that kind of cash. You're paying that much because Razer says it's the first wireless mouse that's actually gaming grade, with a latency of just 1ms—twice as fast as other wireless mice, and the same 1000Hz polling rate as their own wired mice. In other words, they're promising zero lag while taking the gaming mouse DPI wars to the unwanted and ridiculous new level of 5,600 DPI.
It uses 2.4GHz for wireless, just like Microsoft's SideWinder X8 and Logitech's now old-school G7 (and every other wireless device) but supposedly Mamba detects and avoids noisy channels to skirt by interference. In this respect, does live up to the hype—at least when you've got sufficient juice. After using it in a couple weekends of Team Fortress 2 and Left 4 Dead, I really didn't notice any response difference between it and my wired mouse. It's perfectly lag-free and twitchily responsive. Wakeup is also surprisingly quick, or at least it was with the 1.02 firmware—it seems a bit slower with the 1.03 update, which is designed to improve battery life. I also never noticed any interference, despite running in close proximity to my dual-band router and the X8, actually.
Where the polish rubs off and shows some rough patches are on the battery and software front. Razer claims 72 hours of "normal gaming usage" and 14 hours of continuous gaming. I didn't quite have the balls to game for 14 hours straight, but with Razer's 1.02 firmware, I never got more than 48 hours of what I'd call normal usage battery life, and when it drops to that last bar of battery, it does not play well at all. They've since released firmware 1.03, which is supposed to improve battery life. Installing the update on Vista 64-bit is something of an arcane science: You have to boot into a mode where it accepts drivers that aren't digitally signed, and then the update process itself requires a second mouse. The configurator software, while it provides a full-featured set of options, is not as responsive as I'd like—it takes a bit to read the mouse's settings (which are stored onboard) and longer still to change them.
When your battery does get low, you can plug the USB cable into the mouse to play and charge, turning it into a standard wired mouse with the same 1ms latency. It pops easily out of the charging cube/wireless receiver, but for some reason it tends to fight you to avoid plugging into the mouse, which is my biggest problem with the otherwise smart modular design.
Ergonomically, it's one of the best mice around. It's essentially a lighter version ofRazer's DeathAdder, though with the addition of a new groove for your pinkie, which took me a little bit to get used to. My only problem with the button placement is that the DPI selection buttons are not distinct enough, so if you're trying to quickly drop the DPI down to precisely snipe someone's head off, you might crank it up instead and shoot the guy in the foot. The texture is a nice use of rubber—it's not super sticky and rubbery, so your hand doesn't feel weird and gross if it gets sweaty, but it does give you a solid grip.
As I suspected when I eyeballed it, ergonomically it's the best SideWinder mouse yet, and the first one I actually felt totally comfortable using. The sharp spine has been softened into a far more pleasant hump, though it retains the same overall shame as the past two. (It's huge.) So, it's not as sleek as the Mamba, but they have finally nailed the way it should feel in your hand. The unorthodox vertical thumb buttons have been reshaped into ergonomic slopes that form a groove for your thumb, so after the initial adjustment period, this touch finally works. The metal scroll wheel isn't super fantastico to use a lot, but the on-the-fly DPI buttons have a good placement in the middle, but need to be larger—it's too easy to hit the wrong one. The textured plastic feels a little cheap, too.
It uses 2.4GHz wireless at a 500Hz polling rate (half of Mamba's) and can crank the DPI up to 4000. Playing the same games as I did with Mamba—TF2 and L4D—again, I never noticed any real difference in response versus my usual wired mouse. In other words, it seemed lag-free to me. On the DPI front, you can only pick between three steps at a time—not five, like on the Mamba or on-the-fly. One superior touch over the Mamba is the built-in LCD that displays your DPI setting—on Mamba you have to decode what the combination of green and red bars on the side mean. On the other hand, try to find where it displays battery life. (I couldn't.) Speaking of, the battery life is vastly superior to Mamba—I got over five solid days with four intense three-hour gaming sessions on a single charge.
If you had to pick a headlining technical feature (since Mamba also eclipsed its 4000DPI crown), it'd probably be that it uses Microsoft's BlueTrack technology which can track on anything. Indeed, it worked perfectly on multiple surfaces, including a a glossy plastic SteelSeries SP pad that Mamba wouldn't touch at all. (My standard surface is the cloth SteelSeries QcK+, in case you're wondering.) So if you game on crazy surfaces, BlueTrack is a definite check in the X8's column.
The charging dock/receiver is more functional and less "ooooh" than Razer's—it's a hockey puck with a groove for wrapping the cable. But what's neato is that the play-and-charge cable attaches to the mouse magnetically so there's no trying to cram it into a stubborn hole like on the Mamba.
Can you cut the cord and achieve sweet, wireless freedom while feeling safe that your fragging powers are undiminished? Yep. Response time felt the same for every mouse I used: X8, Mamba and my wired mice. Which means two things: Gaming-grade wireless is here (just in case you doubted it), and performance isn't the reason you should pick the Mamba over the X8.
Mamba has better design, feels better (especially if you have smaller hands) and more functional software. The SideWinder X8 has longer battery life, less finicky software and it's much cheaper. You can get the X8 for about $75, while Mamba isvery much $130. As always, whether or not the frills of gaming gear is worth the extra scratch is up to you, and this is more true here than usual, given the price gap. [Razer, Microsoft]
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