Product Description: MT-8 Smart check line instrument using advanced frequency generating device, and generate an alarm sound in the audio audible end, the closer the distance, the sound louder. External headphones to listen to the voice recognition in a noisy environment, by looking for other metal cable adapter. Check cable tester with RJ45 and RJ11 line sequence check function. Is the current market state-of-the-art network cabling instrument Zhengzhou Department of Electronic Instrument Co., Ltd. Address: Erqi Square east of the Sun and Moon Star City, West Street, 19th Floor, Tel :0371-66,959,363 / 55,933,205 QQ: 1,036,362,302 Sales: Manager Zhao 13017693918 Website : http://www.huike17.com