? stable and anti-interference 2.4ghz wireless transmission technology provides a powerful and reliable connection up to 33ft (10m). 3 adjustable cpi levels, 800-1200-1600, easily change the computer mouse sensitivity to match your activity. ? sensitive and noiseless quiet clicks free your worry about bothering others beside you and keep you focused while working or studying. the optical laser allows for quick response, precise movement, and smoother tracking. ? skin-friendly for comfort streamline design with anti-fingerprint and sweat-resistant finish offers your hand maximum support and comfort. the sturdy anti-slip rubber scroll wheel ensures that your hand will not slip when scrolling. ? portable and pocket size featuring slim (4.5*2.4*1.3in/115*62*32mm) which is twice thinner than ordinary mice, this portable wireless mouse is perfect for traveling. it can be easily put into your backpack or pocket. (note: the nano receiver is stored in the back of the silent mouse.) ? low power consumption and strong compatibility powered by 2 aaa batteries. with short-circuit, protection, and an independent power supply function, this wireless mouse with a separate switch button can still work with 1 battery. it would enter into a power-saving mode in 10mins of inactivity. well compatible with windows7/8/10/xp, vista7/8 and linux, etc.