This instrument is a handheld cable testing tool with enhanced cable application type, more functions and wider application range. It is an indispensable testing tool for telecommunications engineers, wiring engineers, and network maintenance personnel. Features: Hunting function: Quickly find the required wire pair among the numerous wire pairs. Suitable for RJ45 interface network cables. The RJ11 interface telephone line and the hunting of other metal wires can be transferred through the adapter. When searching for cable lines, there is no need to strip the outer skin of the line, more convenient to use, and can identify the location of the line breakpoint. Line alignment function: it can completely detect the line sequence, open circuit, short circuit, and reverse connection of the network cable. Telephone line positive and negative polarity detection. Wire continuity detection. Specifications: Material: ABS Color: Black Working Temperature: 0~40 Storage Temperature: -10~50 Altitude: le;2000 meters Explosion-proof type: IP40 Transmission range: 300m Package Weight: 456g / 1oz Package Size: 23.5 * 14.2 * 5.5cm / 9.25 * 5.59 * 2.16in Packing List: 1 * Transmitter 1 * Receiver 1 * RJ11 alligator clip 1 * RJ45 adapter cable 1 * Headphones 2 * 6F22/9V battery 1 * Storage bag 1 * User Manual (English)