ALLEK&reg; Red 2.4GHz Noise Reduction Wireless Silent Click Mouse with 4 Buttons 1600 DPI The advanced 2.4 GHz Wireless technology. Precision control with 3 DPI settings: 1000 / 1200 / 1600. Special light off switch , super save the battery. When the mouse returns to the sleeping state automatically, you just need click the button, then it could be worked again. Ergonomic design with soft grip.It will be more comfortable.The 4 keys wireless mouse measures 4.13" x 2.7" x 1.37" Special soundless design, you can use it in your home or office to build a quiet office atmosphere. 2AAA Batteries(NOT Included).Compatible with Windows 98/2000/XP/Win7/Win8/Vista/Mac