Amazon is selling the HP Wireless Eco-Comfort mobile mouse for just $21.08, originally priced at $49.99. Featuring energy efficient components that allow a single AA battery lasts up to 7 months — includes “automatic power saving features with smart standby modes.” Product page.

2 additional programmable buttons easily accessible on the top left side allow you launch applications, control sound volume, navigate backward and forward, zoom in and out or launch your favorite websites.

[via Amazon]