ERGONOMIC SHAPE - Particular height and angle can be used in a relaxed posture from the palm to the wrist and arm. SILENT CLICK SWITCH - A Silent switch does not make a ticking sound. You can use mouse during the meetings, early in the morning and night work, even when you work at home, without worrying about the sounds around you. BLUETOOTH CONNECTION MODEL -The mouse can be used on any HOGP-compatible PC without the need to connect a receiver, effective for devices with few USB ports. A connection destination switching function allows connection to up to two Bluetooth mouse-compatible devices. CUSTOMIZABLE BUTTONS - The button function assignment ELECOM Mouse Assistant software, which can be downloaded from the website, allows you to customize the buttons to your preferred functions. DIMENSION & WEIGHT - 3.0in x 4.5in x 2.2in, Weight: 3.2oz