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At the end of the day, I think that the Logitech G502 Lightspeed will be the better choice for most people looking for a high-end wireless gaming mouse. It's true that you have to pay more for it, but the increased optical sensor accuracy, higher DPI range, and more extensive weight-tuning options will very much come in handy if you're looking to take your gaming experience to the next level. The bigger battery life is great, too, as you won't need to worry about charging it very much. If money is no object, you’ll struggle to find a better mouse than the Logitech G903. Thanks to the addition of Logitech’s Lightspeed technology, it’s one of the most responsive and reliable wireless mice available. On plugging the 2.4GHz Lightspeed dongle into a spare USB 3.0 port, the mouse instantly connected. Since then it’s offered an entirely latency-free gaming experience that matches many of the wired sets I’ve tested for responsiveness – and is completely free of the bugs we experienced when testing the competing Razer Mamba + Firefly. The mouse can also be connected to your computer using the supplied USB charging cable. Your mouse works in data-over-cable mode when it’s plugged into the computer. This connection also charges the battery. Starting with the basics, the G903 comes with up to 11 keys, depending on how you set it up. Out of the box, there are two extras on its left side and an option to add two more to the right using a magnetically attached plastic plug.
The idea here is to let gamers set up the mouse for either their left or right hand – which, as a lefty myself, is very welcome indeed. You may even choose to go all-out, and have four side buttons – although, personally, I think that’s overkill, even if you’re an avid MOBA or ARPG player.
Like pretty much every G-series peripheral, the G903 can be customised using Logitech‘s Gaming Software. Once installed, you can adjust the G903’s RGB lighting, sync it across all your other Logitech peripherals, and alter its DPI sensitivity.
Your mouse uses a USB gaming receiver to relay wireless signals from the mouse to your computer. To optimize the wireless connection, plug one end of the cable into your computer and the other end into the USB adapter and receiver. You can also plug the receiver directly into your computer.
Get ready for endless gameplay. The POWERPLAY wireless charging system keeps G903 and other compatible G mice charged while at rest and at play.* Just attach the included POWERCORE replacing the optional 10 g weight and cover. Never worry about battery life again. Performance is an area in which wireless mice have traditionally always fallen behind. They’re generally less responsive and more prone to latency than their cabled brethren. Fortunately, this isn’t an issue at all with the G903 for a few reasons. Up top you’ll find basic buttons to adjust the G903’s DPI, and switch between a smooth or step action on its wheel, plus the usual left and right controls.
The Logitech G903 might be a wireless gaming mouse, but it feels as seamless as a wired one. That’s no small feat, and that’s all thanks to the same Lightspeed Wireless technology that was also in the G900. We never experienced any latency or loss if signal despite using the peripheral in an office saturated with Wi-Fi, Bluetooth and every other type of wireless signal.Some will argue that optical sensors are better than five-year-old laser technology, meanwhile, on paper Razer has a leg up on the sensitivity department. Ultimately, though, after using both mice for a week at the same time, we can confidently say they’re both equally as accurate and reliable. Second, and more importantly, is the G903’s use of Logitech’s stellar Lightspeed wireless connectivity. Lightspeed is a custom tech designed to offer gamers an insane and unnoticeable 1ms response rate. It’s worked a treat on past products such as the stellar Logitech G613 wireless keyboard, and this remains the case here. RF antenna is designed specifically for LIGHTSPEED for absolute minimum impedance and maximum signal strength.
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