✮ Features: Easy to penetrate 10km optic fiber, outstanding performance. Slider switch design allows you to control the on/off of the red pen as you wish. The body is made of aluminum alloy to prevent damage during like. Applicable to SC ST FC interface,more universal fitment. Wide range of working temperature from 0~60℃. ✮ Specification: Item Type:Visual Fault Locator Output Light Power:>10mW Output Wavelength: 650nm Using Temperature:0~60℃ Measuring Range: 10Km Voltage: 1.5V Size:175 x 26 x 26mm / 6.89 x 1.02 x 1.02in Battery:2 x AA Battery(Not Included) ✮ Applications: Telecommunications Engineering and Maintenance CATV engineering and maintenance Cabling System Other fiber-optic project ✮ Package List: 1 x Fault Locating Tester 1 x Bag 1 x Rope 1 x Fc to LC Female Adapter