Arion Rapoo 3920P 5G Wireless SURFREE Mouse With Optical Laser Engine Free on Glass Surface - Black Powerful long-range 5G wireless: Lean back and browse from the couch with a fast, reliable 5GHz wireless connection, keeping interference away from other bluetooth and Wi-Fi channels New SURFREE technology, moving freely on all surfaces, including reflective, transparent glasses Adjustable 880/1650 DPI high-definition tracking engine. Portable, Nano-receiver build-in design Rapoo's latest energy saving technology and power switch, battery life up to 12 MONTHS. Operates with a single or double battery 4D Scroll wheel make scroll up/down, scroll side to side and as a button too. Advanced programmable buttons set a hotkey for "progress" keys and macros