1、Optical or Coaxial to Analog Converter: Converts high definition digital signals from TV's optical or coaxial input to analog signal output. Compatible with devices like smartphones, tablets, computers, TVs, speakers, amplifiers, and headphones. 2、TV to Old Amplifier or Speaker Adapter: This adapter can connect TVs, HD players, DVD players, and network set top boxes to old amplifiers, speakers, and headphones via optical or coaxial interfaces. 3、Bluetooth Receiver: Equipped with Bluetooth 5.1 chip for stronger and faster performance. Stable connection with no lag or delay up to 30 meters away for seamless sound streaming. 4、Plug and Play: Supports lossless formats from USB drives or memory cards. Directly reads from USB drives or memory cards on amplifiers with plug and play functionality for easy access to favorite music. 5、Rugged Construction: Optical to analog adapter is made from aluminum alloy and electronic components, it is fire retardant, high temperature resistant, not easy to break.