http://www.amazon.in/Dell-MS116-Optical-Scroll-Wheel/dp/B01ACD5C0W/ref=gbps_tit_s-4_1eea_e64a8e9f?smid=AT95IG9ONZD7S&pf_rd_p=0100aad1-8003-418d-9e50-852d2aea1eea&pf_rd_s=slot-4&pf_rd_t=701&pf_rd_i=gb_main&pf_rd_m=A1VBAL9TL5WCBF&pf_rd_r=1H6A36BRMEQHE50Q3FAH

• Connectivity Technology: Wired - USB, Weight: 413 g
• Movement Detection Technology: Optical, Movement Resolution: 1000 dpi
• DELL India Original Product
• 1 Year National Warranty by DELL