About this item Headphone Extension: Extends the reach of your 3.5mm TRS headphones. Clear Stereo Audio: Ensures high-fidelity and uncompromised sound quality. Durable Construction: Built for reliable performance and long-lasting use. Versatile Length: 10 x 1 x 4 inches for flexible monitoring and listening. Universal Compatibility: Works with smartphones, tablets, and MP3 players. Size description: 10 x 1 x 4 inches.