This adapter can be plugged into a 3.5mm optical socket (found on minidisc players, laptops and many devices) to create a standard optical input/output, enabling a standard optical (TOSLINK, SPDIF) cable to be used. 3.5mm optical connections are not the same as 3.5mm analogue audio connections like on many MP3 players, please check and make sure you have the right connection on your device before purchase. Specifications: Product name: Mini Fiber Optic Adapter Product weight: 12g Material: ABS + Metal Color: Black Length: 2.5cm/0.98in (Approx.) Connector A: Toslink female Connector A: 3.5mm mini plug male Features: Gold plated tip for corrosion resistance. Connections: Fiber Optic Toslink Jack to 3.5mm Mini connector adapter. Use this adapter to change your toslink connector to a 3.5mm mini connector to enjoy the best digital audio has to offer. Package includes: 3* Digital Fiber Optic Audio Coupler(Mini Toslink)