Logitech M705 Marathon Wireless Mouse – Long 3 Year Battery Life Ergonomic Sculpted Right-Hand Shape Hyper-Fast Scrolling and USB Unifying Receiver for Computers and laptops Dark Gray

This is a great mouse for reasons all stated in other reviews. However, some complaints I've seen about this mouse in other websites come from people who have not read the manual and missed some features this mouse offers that address their complaints.You don't know what to do with the receiver when transporting your laptop?First, the mouse does have a compartment for the receiver. The receiver is tiny already, so most people will just leave it inserted in their laptops during transport. However if you wish to store it with the mouse, you can do so. It does not require you to take out the batteries themselves to store the receiver, but you do have to take the battery cover off to access the compartment.The mouse is too heavy for you?The most awesome and rarely mentioned feature about the mouse is the ability to modify its weight and center of gravity by only using one AA battery instead of two. The reason this is so cool is because it gives you an option to lower the weight of the mouse if you think it is too heavy with 2 batteries (I thought so). You can also to change the way the weight feels in your hand by placing the battery in the slot closest to the center of the mouse or closer to the back of the mouse. Some people prefer the weight of the mouse to be on the back while others prefer it to be more centered. I left mine in the center.How does it work with just one battery?If you notice, the two batteries in its compartment are used in parallel (both installed looking the same way), instead of 'in series' like most electronics do (going the opposite way). The mouse works on 1.5 volts instead of 3.0 volts like the usual 2 AA battery equipment would. This is what permits the 3 year battery time. Of course, using one battery means it will probably only last about half the time as using two. I'm not an electrical engineer so I don't have much knowledge regarding the efficiency of using two instead of one battery.How does this compare to other logitech mice in size and weight?I use a wired Logitech G9 Laser Mouse for my desktop pc, which weights 122 grams with no additional optional weights inside. I just add 4 grams of weight for my preferences. In comparison the Marathon M705 weighs 88 grams without batteries. With one battery it weighs 112 grams and 136 grams with two. The batteries it comes with weigh 24 grams each (other brands of batteries might have a different weight). So, with two batteries this mouse is heavier than a G9 even though it is slightly shorter lengthwise and slightly thinner as well. The M705 is about 4.5 inches long, 2.8 inches wide, and 1.5 inches tall.As a G9 user, this was the closest feel I could find in a wireless mouse. All other ones either felt too big forcing you to place your entire palm on them and disallow an optional claw grip or felt not wide enough for my hands. I enjoy the width of the G9, and even though the M705 is not as wide and connecting with as much of my palm as I would want it, it does not make my hand cramp up as most other narrower portable mice and I can use it for games without feeling like I'm using a non-full-featured mouse. It is the perfect blend of portable and full sized featured mouse.My only gripes:The DPI on the mouse cannot be modified. This is understandable as it is not a gaming mouse. When compared to the G9, it seems that is it is permanently set at 1000 dpi. Another problem is that it has negative acceleration. This means that when you move it fast from side to side, it registers less movement the faster you move it. This only occurs at high speed movements, such as doing a quick turn on a first person shooter game. Again, I don't detract from the rating of the mouse, because it is not meant for gaming, but I thought I would include this in the review as some people might want this information.Edit: I'm adding an image of the M705 vs G9 to the product page so you can judge the size difference. I looked for this online but it seems not too many G9 owners have yet bought this mouse since it hasn't been out for very long.

===============Update after 3 years===============I replaced my mouse once after 1.5 years of heavy gaming. Right mouse button became glitchy. I think it's because I have a bad habit of holding it entire time and rotating it around in game, which is a lot of stress for a mouse button, trust me %). I called Logitech and they sent me new mouse no questions asked, awesome customer service. New mouse arrived within a week or so and I had it for 1.5 year by now, it still works perfectly.The mouse is very ergonomic and comfortable, my wrist and hand do not feel any fatigue no matter how much time I spend in front of computer.And yes, I don't remember when was the last time I changed the battery, I don't think I ever did actually.==============>Previous review below=============>I've bought that mouse as a replacement for A4tech G7-750. Main reason was that old one was draining batteries extremely fast, i use to change em once in 2 weeks. I'm used to small mouses so i needed something rather small, with extra buttons that fits gaming purposes and wireless, as I am an laptop user. New Logitech M750 arrived well packed with no delays and no any damage (thank you Amazon). I've got see-through package as its cheaper.Mouse itself feels rather heavy-duty and solid.I plugged adapter in and it worked right the way with no any extra installations. But if you want to track battery and use 3rd extra button - you have to install driver from Logitech site, its fast and easy.Took a week for me to get used for this mouse while gaming (mouse is very important tool, you know) Main reason was that this mouse is rather heavy due to 2xAA batterys, instead of AAA that was in my previous mouse. And size is rather medium than small, but still smaller than full-size mice.I'm using it for 3rd months and it works well for me.Pros:Wireless, but still good precision and response3 years of battery use (OMG) and you can track it, if you installed Logitech M750 drivers.3 extra buttonsHandy fast-scrolling thingNo need to assign any keyboard buttons to 3 extra buttons on mouse, they are just extra-mouse-buttons 4/5 i think, and can be used in-game like this as well.ConsRather heavy, if you like slow mouses with higher precision it might work for you as advantageSo I'd say it's a good product, as most Logitech mice. And works for gaming too!