LOGITECH ERGO M575 is a wireless trackball with a comfortable, ergonomic shape.Using the M575 is very convenient, because the user does not need to move his hand to move the cursor, which allows not to strain the hand joint.Thanks to smooth and precise thumb control, the ERGO M575 trackball can be used anywhere - and since it doesn't need to be moved, it's perfect for desks with limited space. Sensor: TrackballNumber of buttons: 5Number of scroll wheels: 1Form: LabrocResolution: 2000 DPIWireless connection: USB receiver 2.4 GHz + BluetoothPower supply: 1xAA batteryDimensions: 134 x 100 x 48 mmWeight: 145g