Features Easy Testing: Anti interference and noise free on load line searching, capable of searching for network cables, telephone lines, BNC coaxial lines, and various metal wire receivers. Sensitivity adjustable from 0 to 0.5 meters. LED Indicator: Port flashing function, quickly find the corresponding wire head of the switch by observing the flashing frequency of the LED lights on the switch and router. Wide in Utility: Cable continuity test, which can test the open circuit, short circuit, crossover, and crosstalk of network cables, telephone lines, and BNC coaxial lines. Great for Wiring: The testing can detect packet loss in both local and external networks, automatically obtain IP addresses, or manually modify IP addresses to complete network installation and layout. Simple Carrying: Comes with a compact size and a light weight as well, the network cable tester is very convenient to carry for outdoor work. Specification: Item Type: Network Cable Tester Model: NF-8209S Material: ABS Display: LED Indicator Light Transmitter Signal Distance: Approx. > 300m / 984.25ft Output Signal Level: About 23Vp-p, adjustable frequency.  Flashlight Lighting: Yes Automatic Shutdown: Yes, automatic shutdown after about 10 minutes without any operation.  Transmitter Battery: 3.7V lithium battery 1400mAh, shipped with built in battery.  Receiver Battery: 3.7V lithium battery 1400mAh, shipped with built in battery.  Package List: 1 x Network Cable Tester 1 x Receiver 1 x Earphones 1 x RJ11 Adapter Cable 1 x RJ45 Adapter Cable 1 x Crocodile Clip Adapter Cable 1 x USB Cable 1 x User Manual 1 x Tool Kit Package List 1 x Network Cable Tester 1 x Receiver 1 x Earphones 1 x RJ11 Adapter Cable 1 x RJ45 Adapter Cable 1 x Crocodile Clip Adapter Cable 1 x USB Cable 1 x User Manual 1 x Tool Kit