Reliable Warranty - MillSO offers a 12-month unconditional Warranty for our stereo 1/4 to dual 3.5mm female headphone adapter to guard against any quality trouble or compatibility issue. You can extend it to 18 months by contacting MillSO 24-hour customer support team. We are more than happy to solve any problem for you!. Quadr-Layer Shielding: Dual 3.5mm to 1/4 headphone 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. MillSO 1/4 inch to dual 3.5mm audio splitter is very portable and has a quick response, tight connection, and flexible convert a 6.35mm port to a 3.5mm port. Qualified Audio Adapter: MillSO 6.35mm to 3.5mm dual adapter is designed with 24K gold-plated connectors, ensuring 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. Standard 3.5mm jack and 6.35mm plug have outstanding compatibility which connects your devices firmly and ensures you enjoy wonderful music. One More Spare Female Connector: This new 1/4 to 3.5mm headphone splitter has the same function as the MillSO 1/4 male to 3.5mm female headphone adapter (: B07DFFBNC5), but with an additional 3.5mm female jack, which allows you to transfer audio to two headphones, or one headphone, both ok. (Notice: the devices you use should also have a TRS stereo jack. Only transfer audio between devices, no mic function.). MillSO 1/4 to dual 1/8 adapter is two 3.5mm female jacks into a 6.35mm male plug adapter, ideal for connecting audio devices with a 6.35mm stereo jack to headphones or speakers with standard 3.5mm plugs. Eg: piano keyboard to two headphones adapter, guitar amp to dual speaker adapter, amplifier to double headphones adapter, amplifier to speaker adapter, 6.35mm headphone to computer adapter, mixing console to speaker adapter...