Spritech TM 2.4G Ev Laser Human Ergonomic Wireless Mouse 5 Button Vertical Ergonomic Mouse Laser stable transmission, transmission speed. After the circuit design optimization and procedure strengthening, the stability of EV vertical mouse is improved greatly which will provide you more precise positioning Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. Wireless freedom: Control laptop, desktop computer or home theater PC from up to 30 feet (10 meters) away. Perfect for all computer worker,such as: office white-collar,software engineer, internet surfers, gamers and people who work at length at the computer. Adopt low power laser light, low power consumption.