The Lenovo Essential Compact Wireless Mouse, designed with your convenience in mind. It?s easy to get more done when you don?t have to waste time untangling messy cables or searching the office for new batteries. Its compact size makes it the perfect companion no matter what the occasion. Slide it into your pocket, backpack, or laptop bag, and you?re ready to go. MouseButtons typePressed buttonsPurposeOfficeRecommended usageUniversalScrolling directionsVerticalScroll typeWheelNumber of scroll wheels1CertificationANATEL, ANRT, CAK, CB, CE, CERT, CITC, CITRA, CONATEL, cTUVus, ETA, FCC, IC, ICASA, ICT, IDA, IFETEL, MIC, MTC, NCC, NTC, SDoC, SDPPI, SIRIM, SRRC, SUBTEL, TRA, TRC, TUV Mark, VCCIMovement detection technologyOpticalButtons quantity3Device interfaceRF Wireless