Model: Marathon M705Model code: 910-006034Sensor technology: Logitech Precision Optical TrackingRated value: 1000 dpiNumber of buttons: 7 (left/right click, back/forward, scroll wheel with middle click and left/right click)Battery type: 2 x AA battery (included)Battery life with Logi Unifying USB receiver: up to 36 monthsConnection type: 2.4GHz Logi Unifying USB receiverWireless range: 10m wireless range Dimensions:Height: 109mmWidth: 71mmDepth: 42mmWeight: 135g (with AA batteries)