The MX1000 is the first Logitech mouse to have a battery readout. The three LEDs show the current battery state. When fully charged, the mouse is good for about 20 days of work. 10 minutes of charging give the mouse power for a full day. Charging from completely empty to full takes about 3-4 hours. The mouse uses a Lithium-Ion battery which does not suffer from the dreaded memory effect.
Memory effect is a common problem with Nickel-Cadmium- (NiCd) and Metal-Hydrid (MeH) batteries. If a battery is not completely drained before recharging, it "remembers" the charge it had before the recharging started. This remaining charge is no longer available for use. Over time this can lead to a total usable battery capacity of zero.
When running low on power, the last LED on the mouse turns from green to red and a little icon in the system notification area starts to blink. This happened after about three days of intensive use with the mouse never charged, just what charge it had out of the box. After another five hours with power warning and red LED the battery was completely empty.
Instead of using an LED like traditional optical mice, Logitech has chosen to use a laser, the beam is infrared, that is why it is not visible. Logitech has also taken great care to ensure the laser is absolutely harmless:
The Class 1 laser used in the MX1000 is extremely low-powered and can be stared directly into, even with a magnifying glass, for extended periods without causing any eye damage.On above picture you can also see the On/Off switch and the reset button. When not using the mouse for extended periods of time or when travelling, Logitech recommends turning the mouse off to keep battery consumption at a minimum. During all testing I never had to reset the mouse, so the reset button is probably there as a safeguard.
The mousewheel allows you to scroll up/down and left/right. Additionally to that, the mouse two buttons located in front and behind of the mouse wheel which are used for fast scrolling through documents.
The forward/back buttons are conveniently located, however I wonder why you have to move the thumb to press them. I would have preferred it if the buttons were on the same height as the thumb rest. The button in the middle is used to switch between programs by default. I changed it to close window.
A cordless mouse can be stolen very easily - especially if you got to Lan parties a lot :) It would have been nice if Logitech added a little hole or something where you can chain your mouse to when leaving the PC on a LAN.