ELECOM Mouse Wireless Trackball S Size Small Thumb 5 Buttons Quiet Black (Receiver Included) M-MT1DRSBK

``BITRA'' is a thumb-operated wireless mobile trackball that has a compact design that is ideal for mobile use, yet provides high operability. [Connection method] Wireless 2.4Ghz (receiver included) [Number of buttons] 5 buttons *Including wheel button Width 73.7mm x depth 89.9mm x height 41.3mm [Power source] 1 AAA alkaline battery, AAA manganese battery, or AAA nickel-metal hydride battery (estimated battery usage period: approximately 110 days)