Logitech MK550 Wireless Wave Keyboard and Mouse Combo, Ergonomic Wave Design, Black USB Wireless RF 2.40 GHz Keyboard - 117 Key - Black - USB Wireless RF Mouse - Laser - 1000 dpi - Scroll Wheel - Black - Email, Internet Key, Volume Control Hot Key(s) - AA - Compatible with Computer for PC - 1 Wireless Wave Combo MK550 features a tiny leave-in nano receiver, extended battery life, and low-battery indicator. The curved keyboard promotes an ergonomically correct hand position. Included high-performance laser mouse features contoured sides and soft rubber grips for precision and control. Use cushioned palm rest for extra support. The MK550 also features extra-large hot keys for access to your favorite activities. Package Contents: Wireless Wave Combo MK550 Logitech Unifying receiver 4 AA alkaline batteries (pre-installed) User documentation