Feature: The MT-7028 lets you easily locate and verify the cable status and troubleshoot wiring for continuity, shorts, opens and crossover on RJ45 Lan cable Cat 5、 5e、 6、 7 (UTP/STP)、 RJ11/12 Telephone cable Cat. 3 (2/4/6 pin) & normal solid/Stranded wire by alligator clips patch cord. Ideal for all installation and maintenance fields of telecommunication, networking, datacom, Audio/Video, cable TV, and all weather cabling, etc. MT-7028 Transmitter specifications: Tone frequency: 1kHz Max. distance of transmission &Cable map: ≧ 3km &300m Tone mode: Hi/Low two-note tone Compatible connectors: RJ45(8 pin)/RJ11(6 pin) compatible connectors for RJ45(8 pin)、 RJ11/12(6P/2C/4C/6C) cable map and RJ45 tone、 RJ-11(6 pin) connectors for RJ11/12(6P/2C/4C/6C) tone Cable types tested: RJ45 Lan cable Cat 5、 5e、 6、 7 (UTP/STP)、 RJ11/12 Telephone cable Cat 3 (6P/2C/4C/6C) Continuity test: 1 LED (≦ 300Ω ), Coaxial cable & normal solid/Stranded wire by alligator clips patch cord. Cable map & Shielded indication: 8 LEDs& 1LED, Fast/Slow dual speed Phone line polarity indication: 1 Dual color LED Other function Live telecommunication equipment test and router test: Live telecommunication equipment test and router test, Voltage protection AC 60V or DC 48V, Auto power off, Low battery display MT-7028 Receiver specifications: Frequency: 1kHz Compatible connectors: RJ45(8 pin)/RJ11(6 pin) Signal status indication: 1 LED & Buzzer, building ear jack Cable map & Shielded indication: 8 LEDs & 1LED NCV indication: 1 LED (AC90~1000V) LED illumination: 1 LED Battery type: DC 9.0V (NEDA 1604/ 6F22 DC9V x 1pcs) Dimension (L x W x D): 198 x 45 x 33 mm Accessories: RJ45 cable patch cord、 RJ11 cable patch cord、 Alligator clips patch cord、 Earphone、 pouch bag.