Features: Converts Coaxial digital audio signals to analog L/R audio Provides electromagnetic-noise-free transmission. Easy to install and simple to operate. Powered by USB port. Bluetooth-compatible5.0 , USB, with 3.5 optical fiber, digital model conversion and transmission to ordinary speakers for playback. Upgrade and used for speakers Home theater, U disk music, family singing,mobilephone music. Specifications: Name: Wireless Receiving Digital-to-analog Audio Converter Input: 3.5 Optical/coaxial/bluetooth-compatible5.0/u Disk Output: Rca Left And Right Channels/3.5 Stereo Chip: Zhongke Ab5301a Power Supply Interface: DC5V2A Bluetooth-Version: BT5.0 Power consumption: 0.5W Specifications:approx 10.5x7.3x2.3cm/4.13x2.87x0.9in Shell: Metal for Shell Colour: Black Note: This item NOT convert Dolby. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x Digital to Analog Audio Converter Adapter 1 x USB Power Cable 1 x Antenna 1 x English User Manual