1.This extremely portable, wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses 2.Transmitter mode:wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers 3.Receiver mode: wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones 4.Switch between transmitter and receiver modes with the simple flick of a switch. Effortlessly connect using advanced Bluetooth technology and 3.5mm audio cable (included). 5.Super-Portable Audio-Streaming Power Bluetooth 5.1 :Enjoy faster and more stable connections with the latest Bluetooth 5.1 technology. 4-in-1 Audio Receiver :This adapter can be used as a receiver, transmitter, audio controller, and USB dongle, making it a versatile tool for all your audio needs. Wireless Adapter :Say goodbye to tangled wires and enjoy the freedom of wireless connectivity with this adapter. AAC Support :Enjoy high-quality audio with the adapter's support for AAC, a codec that provides better sound clarity and compression. Product Name:4 IN 1 USB Bluetooth adapter Product version:Standard Bluetooth version: Bluetooth v5.1 Chip:AC6951C Transmission Range: 10-20m (barrier free) Interface: 3.5mm AUX Input parameter: DC 5V-2.1A (MAX) Support Protocol: A2DP/AVRCP Using Method:Drive free Basic Functions(4 In 1 Upgraded): Bluetooth receiving, Bluetooth transmitting, PC transmitting, External sound card. Support Devices:All kinds of speakers,desktop computer,laptop, TV,power amplifier,projector. Colour:Black Material:plastic Package Contents: 1 x Audio Receiver Kit(Due to different product batches, the appearance , whichdoes not affect the use) 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.