Función mano: 1. Locating and measuring lenth for RJ11/RJ45 Cable; 2. Wiremap for RJ11/RJ45 Cable,such as open,short,across and split pars; 3. Polarity test for RJ11 indicate the voltage value functions; 4. Puerto flash testng for RJ45 y Función VFL&NCV; 5. Menmory function: export the récord test from the device to PC; Benefits: Big LCD screen 128 x 64 Built-in batería de litio recargable que ahorra energía; Works better frente a interferencias electromagnéticas