MillSO offers lifetime technical support and a 12-month warranty for our 3.5mm Splitter adapter to guard against any quality trouble. If you have any problems, feel free to contact our customer support team via support[at]millso[dot]com. Quadr-Layer Shielding: this headphones adapter perfectly combined tinned coppers, aluminum foil, soft and durable PVC covers, it's high-density shielding protection and effective isolation, offer a full and delicate tone, highly restored quality sound. Qualified 3.5mm Stereo Jack Splitter: 24K gold-plated connectors ensure high stability, high-speed lossless transmission; metal housing is a wear-resistant, anti-corrosion, and solid protection; tin-plated oxygen-free copper wiring for high fidelity, pure sound quality. This AUX Splitter also combines audio from two devices to one headphone/speaker. Eg: transfer audio from two PC to one speaker, seamlessly switch audio between the computer and the phone. Seamlessly switching between TWO audio sources to one speaker without changing wires frequently (Don't play with two different audio at the same time. If the audio from two different audio sources, the volume of the more powerful output will be reduced). Two-way Audio Splitter (NO Mic): MillSO Male to 2Male AUX Splitter split audio from one device to two headphones/speakers. Eg: share audio from a phone to two Bluetooth headphones, share music from a computer to two speakers. It's a wonderful choice to enjoy music with your family at home, share a movie with your kid on vacation, or share a game with your friend. Plug and play, so easy for all people.