Don't Need To Drive Plug and Play Multiple interface ,Meet multiple requirements, easy for older devices to have Bluetooth. Multi-Device Expansion Port Better Connection Effect Bluetooth Audio receiving mode,3.5mm AUX/Coaxial/Optical Fiber audio output,multi-device expansion interface,let you feel better connection effecet. Support a Wide Variety Of Power Amplifier Equipment Compatible with all kinds of old audio amplifier equipment,strong signal without delay,-HD High fidelity,enjoy CD-Grade sound quality. Support -HD Low Latency+High Restore High fidelity -HD enables Bluetooth to have CD-Level sound quality HiFi shock lossless sound quality,high fidelity audio data restoration.Let the wireless connection enjou the wired connection sound quality experience. Large Capacity Lithium Battery Long Endurance Experience 500mAh large-capacity lithium battery with a battery life of up to about 10 hours. Product Mode:D300-HD Bluetooth Version:CSR Bluetooth V5.2 Interface: 3.5mm AUX/Coaxial/Optical Fiber (Note:Only one interface is supported for output, three interfaces do not support simultaneous audio output) Transmission distance:About 15M Charging Type:Type-C Capacity of Battery:500mAh Working Time:About 10 Hours Audio Codec: /-HD//AAC Range:2400MHz-2483.5Mhz Frequency Response:20Hz-20kHz Product Size: 73x70x20mm Compatible Devices: For Wired Speaker/Home Speaker/Power amplifier/Headphone/Car kit Etc Colour:Photo Color Material:PC+metal Package Contents: 1 x Host 1 x Antenna 1 cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.