Upgrade to smarter scrolling, better comfort and more productivity. Contains a minimum of 65% post-consumer recycled material. Logi Bolt receiver, engineered to meet rising security expectations, combined with Bluetooth® Low Energy wirelss technology. Silent clicks and customizable side buttons. SmartWheel scrolling delivers precision and speed the moment you need it. Bluetooth® and USB connectivity. 2.4GHz wireless connection with 10 metres of wireless range. Large. 1 "AA" battery (included). Up to 20 months of battery life. 2-year limited warranty. Graphite.