?WIDE RANGE OF USE?Compatible with all RJ11 devices, such as landline phones, faxes or answering machines. Assistant for home, study, living room, bedroom, office, business meeting, home entertainment and study. ?MATERIAL?High quality sound quality, all copper plated gold needle core, stable transmission signal. Good contact and transmission performance, provide a strong guarantee for stable data transmission, easy to use, convenient connection, no static or sound distortion.RJ11 Coupler plastic cg made of environment-friendly material to protect the internal chip structure, internal insulation, strong anti-interference ability and low signal attenuation coefficient. ?SMALL AND EXQUISITE? SinLoon RJ11 Coupler inline couplers are small and exquisite in size that provides a full range of solutions for voice, home networking, home office and audio. ?NO SIGNAL LOSS?Thickened PBC board, strong and durable, to avoid the problem exposed damage, high temperature resistant, longer service life, RJ11 6P6C Telephone Inline Coupler is used and helps to extend or repair existing patch cables.This inline coupler provides faster data transmission without any signal loss. ?EASY EXTENSION ?Premium quality inline coupler for join 2 RJ11 (6P6C, 6P4C, 6P2C crystal head)telephone lines together and extend phone line connections with strong anti-interference ability.