This is a modular cable (telephone line). I'm selling it because I replaced it to change the length, after using it for about 5 years. I have also checked the electrical conductivity with a tester. ※ The tester in the photo is not included. Cleaning and disinfection have also been carried out. ○ 4-core ○ Flat cable ○ 7m (I actually measured it, and it was just barely 7m.) ○ The manufacturer is unknown, but I bought it at an electronics retailer, so it wasn't a minor brand. I look forward to your purchase if you understand. Thank you for viewing.