Tests Both Shield (ftp) & Unshielded (utp) Cables Via Rj45 Port Tests Rj11 Telephone Lines & Coaxial Cable Via Included Special Adapters Detects Open Circuits Short Circuits & Mismatched Wiring In Any Variety Of Cables LCD Display Provides Clear Results While Showing How Each Wire Matches Up Voice Feedback Locates Up To 8 Far-end Passive Ports Single-chip Microprocessor Watchdog Software Ensures Reliable Operation Low Voltage Battery Alarm & Indicator For Portable Use With Long Battery Life Up To 50 Hours Requires 4 AAA Batteries