Made of PVC copper. 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. | The front and back ends are made of environment-friendly PVC material to protect the internal chip structure, internal insulation, strong anti-interference ability and low signal attenuation coefficient. Oxygen free copper conductor has high fidelity sound quality, exquisite technology, strong anti-interference ability and low signal attenuation coefficient. | This product is used to connect and expand two existing telephone lines through the R11 telephone head (6p4c, 6p2c crystal head) at both ends through the telephone through box. | Thickened PBC board, strong and durable, to avoid the problem exposed damage, high temperature resistant, longer service life, to provide a good firm connection without loss of signal. | 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: 100% brand new high-quality plastic and metal, durable, fine workmanship, corrosion resistance, more stable performance, stable performance, high reliability. | With BIOS alerts, you can easily get feedback, quickly find problems, or ensure normal startup without installing multimedia; through computer power supply, we will hear familiar sounds. | Wiring: red is positive and black is negative (in fact, both positive and negative wires can be used as long as they are connected to the speaker interface). Two 6cm / 2.36 inch red and black wires can keep the PC shell clean and tidy. | The 4-pin female connector is directly inserted into the speaker interface of the main board, which is convenient to insert into the speaker interface of the front panel of the main board. These speakers are used to obtain the beep specification from the main board alarm system and other electronic products. Keep the cables inside your computer cabinet in order. | In many cases, you may not need a complete set of multimedia speakers on your PC or office environment. You can still hear this PC boot specification boot with built-in speaker installation to ensure all work results are accurate. You can also hear a beep confirm when you plug in the USB device.