What is this?RJ11 6P4C phone cord , widely use for fax line, modem, telephoneWhat will I get?The RJ11 6P4C phone cord, provides here, Fit RJ11 plug 6P4C, male to male, cable length:50FTIn the package of: 1pcs Phone CordIs there any advantages of the product?It can be used as an extension cord to connect telephone and modulation equipment together to ensure uninterrupted connection and smooth signal of communication equipmentHow to use it?Steps of intallation:1. Prepare suitable telephone and modulation equipment. 2. The interface is respectively inserted into the telephone lineWhat should I notice?Before purchasing, please confirm whether the plug type of the phone cord plug is correct.