1,Desktop optical metal trackball with 25mm diameter 2,Water/dust-proof,meets ... 3,With click buttons and palm-rest Key Features- Small optical metal trackball(dia:25mm),made of abrasion-resistant stainless steel ... Data• Voltage: 5.0VDC ±5%• Electric current: 10mA• EMC compliant• Optical Trackball resolution: 1000dpiEnvironmental Characteristics• Operating temperature: -20°C to + 60 ...