Requires 2 AAA alkaline batteries
Expected battery life is up to 24 months (2 years)
Installing new batteries
When you install new batteries in your keyboard, make sure they face the correct direction, as shown below.
NOTE: The K220 keyboard is included in the Wireless Combo MK215.
Battery performance tips
Your keyboard enters standby mode to conserve power when it isn’t in use. Here are some other ways you can help extend the battery life:
Use only alkaline batteries. Non-alkaline batteries (such as NiMH or NiCd) operate at a lower voltage and may affect the battery life.
Avoid using your mouse on dark or transparent surfaces, such as glass. These surfaces cause the optical sensor to use more power.
Make sure replacement batteries are new and within the manufacturer's expiration date.
Don't mix old and new batteries.