Introduction Congratulations on your purchase of the most innovative wireless mouse. With an incredible sensitivity to surface details and high tracking speed than other mice, the mouse can track reliably even on tricky polished or wood-grain surfaces. It offers even more advance that will make you more productive and more comfortable. 2 * AAA batteries Battery compartment cover - + Features 2.4GHz (distance 6~8m), 16 Channels/4096 ID Using state-of-art technology. High tracking speed and sensitivity.