"Bought 2 of these mice for use with a T440s and a T440p. Immediately had the problem with intermittent bluetooth connection. I'm new to Windows 8 so it took me a little effort to track down the laptop bluetooth settings (Realtek Bluetooth 4.0 on T440p) under the Device Manager. Under Power Management, disable the power saving feature that turns off bluetooth. After taking care of the bluetooth issue, the mouse has been flawless. Comfortable, portable size. Good pointer control. Just what I would expect."
"Added internal Dell 350 Bluetooth module of insignificant cost on ebay to Dell M-90. Driver on Dell site works fine. Most newer laptops will come with Bluetooth built in to start with. Two AA batteries pop in and out of mouse exceptionally easily. Easiest battery change of any such mouse. This mouse makes use of low power laser such that laser beam not visible to the eye. Mouse power management scheme best of any laser cordless mouse tested here. Batteries last for many months without ever turning the mouse manual power switch off. Resolution fine. Shape, size and ergonomics perfect for this user. Using second of these mice on Lenovo T60p. Elimination of any need for an external receiver and USB slot taken is very welcome. Regularly use XP Pro SP3 but have successfully tested under W7."
"I have had this for one month now with my Ultrabook laptop. This mouse will suddenly disconnect and not work. Others have reported the same problem. Do yourself a favor and buy the USB wireless version or something equivalent."
"I got with my X1 Carbon Touch for work/research. Since the X1 Ultrabook only has 2 USB ports, I thought "Why not get the blutooth mouse to save a USB port!" Good in theory. While great when it works, this mouse will just shut off/disconnect, and I have to turn it on/off a bunch or restart the computer for it to work. It happens frequently(Like 3-5 times in an hour of work) I'm using it 3-5 inches away (so in range). I've now read numerous similar reports on various forums. While I found 3 supposed Lenovo fixes posted by Lenovo, none worked. I'm now getting the Lenovo wireless USB mouse (I want the mini dongle) and have switched to my old Logitech USB mouse (with the thumb-drive sized dongle)."
"I bought this Wifi mouse to go with my Lenovo Carbon (running Windows 8) which has only two USB ports (which I need or other things). The mouse works fine for a short time then it doesn't work at all. I can restart it but with same results, it works only or a few minutes. Our IT department searched for and installed all latest drivers and tried but failed to find the problem. It's a good design, good idea but worthles if it doesn't work."