Item Type: Bluetooth Receiver Transmitter Material: Aluminum Alloy Remote Control Battery Type: Built In 160mAh CR2025 Button Cell (Included) Bluetooth Version: 5.1, Barrier Free Range Up to 30m/98.4ft Interface Type: Optical, Coaxial, Aux, RCA, USB Bluetooth Protocol Support: A2DP, AVRCP Music Format Support: MP3, APE, FLAC, WAV, WMA Package Includes: 1 x Receiver Transmitter 1 x Fiber Optic Cable 1 x Audio Cable 1 x Power Cable 1 x Remote Control 1 x Instruction Manual Professional Design: Supports Bluetooth receive and transmit modes with optical and coaxial digital to analog conversion. Features U disk and AUX audio input with multiple device expansion interfaces to meet various connectivity needs. Plug and Play: Connects to older speakers or amplifiers via AUX or RCA ports, enabling Bluetooth playback on non-Bluetooth speakers. Supports U disk playback, no driver required, easy setup. HiFi Lossless Audio: Delivers high-fidelity, clear, and noise-free sound quality. Supports multiple audio formats including MP3, APE, FLAC, WAV, and WMA for an immersive listening experience. Bluetooth 5.1 Technology: Equipped with a Bluetooth 5.1 chip for stable signal transmission, low latency, and high audio fidelity during wireless playback, providing sound quality comparable to wired connections. Extended Range: Provides up to 30 meters of stable, uninterrupted wireless transmission in open spaces, ensuring strong signal coverage throughout rooms with no dead zones.