【2.4G Wireless Transmission & Stable Connection】2.4GHz wireless two-way transmission technology - Stable connection, precise track, fast data transmission speed. Up to 50ft/15m working distance, eliminates delays, dropouts and interference. 【Ultra-Durable & Ergonomic Design】Up to 5-million-click keystroke test and perform perfectly! Contoured shape and textured rubber grips keep your hand comfortable even after long hours, USB Nano Receiver which can be stored within the back of the mouse. Protable design is suitable for mobile working. 【Intelligent Power Saving】If mouse is not used in 8 minutes or the receiver is disconnected, wireless mouse turn to auto sleeping mode, click any button to restart it. Never worry about frequent battery replacement.