【Excellent Value】 Offers very high quality and functionality at an affordable price. 【Design】 Ergonomic shape design, easy to operate. 【System】 Multi-system compatible, no driver installation required. All Windows system functions available. Keynote software on Mac systems only supports Page Up, Page Down, and blank screen. 【Domestic Standards】 A safe PSC certified product that has cleared standards at a Ministry of Economy, Trade and Industry (METI) approved domestic inspection organization. 【Energy Saving & Battery Included】 Comes with a battery, ready to use immediately.