PRO 2 LIGHTSPEED has a rechargeable 290mAH LiPol battery which provides it with up to 95 hours non-stop gaming at 1ms report rate with lights off, or 60 hours non-stop gaming at 1ms report rate with RGB color cycling on.* – Charge level can be checked when the mouse is powered on or using Logitech G HUB to assign a button to check charge level. – Charge level is displayed for seven seconds at mouse power‑on using the color and number of bars illuminated on the DPI indicator: – 3 green dots = 50–100% – 2 green dots = 30–50% – 1 green dots = 15–30% – 1 flashing red dot = <15% Tips: – You can program a button to show charge level using G HUB. – The bottom dot will flash red when battery is at 15% or less. When this happens, plug in your mouse to charge. – Charge level, power draw, and estimated remaining battery life can be checked in Logitech G HUB.