Dell 9RRC7 Black USB Optical Mouse w/Scroll Wheel. Dell meets the current and future demands of high-performance, power embedded computing, making it ideal for communications, transaction terminal, interactive client, industrial automation applications, as well as for standard home use. Dell Part Number: 9RRC7 09RRC7 CN-09RRC7Compatible Part Numbers: 356WK 5Y2RG 0356WK 05Y2RG CN-0356WK CN-05Y2RG RGR5X 0RGR5X CN-0RGR5XModel Number: MS111-P 330-9456