NetAlly LinkRunner AT 4000 Advanced Network & Cable Tester - Network Testing, Cable Testing, PoE Testing, Fiber Optic Cable Testing, LAN Cable Testing - LCD - 2 x USB - 2 x Network (RJ-45) - 1 Number of Total Expansion Slot(s) - SFP - 1 Number of SFP Slot(s) - Twisted Pair, Optical Fiber - Gigabit Ethernet - 1000Base-T, 1000Base-X, 1000Base-SX, 1000Base-LX, 1000Base-ZX, 100Base-FX - Proprietary Battery Size - Battery Rechargeable - Lithium Ion (Li-Ion):