Feature: Nice gift: We have enough wireless mice, you can buy them for different office or daily use, you can also buy them for your family and friend. Efficient wireless transmission: These cordless mice plug and play, powerful, reliable 2.4GHz wireless mouse connection with high anti interference performance. Specifications: Material: plastic Color: black Size: approx. 4.4 x 2.3 x 1 inches Package include: 20 x Wireless mouse Warm notes: Please allow slight size error due to manual measurement. The colors may exist slight difference due to different screen.