Product Features:

【Bluetooth 5.3 Aux Receiver】: This Bluetooth adapter can add Bluetooth functionality to your vintage stereo/wired speaker/Amplifier/old car stereo, allowing you to enjoy music wirelessly, and answer hands-free calling. Make your party or road trip more fun
【Bluetooth 5.3 Tech, Easy to Use】: One key to power on and enter pairing mode. Built with Bluetooth 5.3 technology, this Bluetooth receiver can provide 2X more stable connection, and 2X faster pairing speed than Bluetooth 5.0
【Hands-free Calling & Navigation】: A built-in microphone and an "MFB" button to answer/redial/hang up/reject calls. Bluetooth audio adapter supports voice navigation and activate Siri. No need to look down at your phone while driving to ensure your driving safety!
【True Wireless Stereo】: The Bluetooth receiver supports True Wireless Stereo (TWS). Purchase two Bluetooth receivers to stream audio to 2 separate sets of speakers - one will become an R channel and the other one will become an L channel, bringing you a great booming stereo. It's good for parties, movies, and music. (Need to buy 2 pieces)
【Long battery Life & Fast Charging】: The built-in battery has a long battery life and can support up to 12 hours of use after full charged. Fast charging and can be fully charged within 2 hours.
【Mini Size & Portable】: This Bluetooth audio adapter is smaller and more portable. Working range up to 33ft, not limited by wires. Support Devices: Home stereo, speakers, headphones, earbuds, audio music streaming sound system, car stereo system, PC, etc.

Product Specifications:

Brand: VAORLO
Product Name: AUX Bluetooth 5.3 Audio Receiver
Bluetooth Version: V5.3+EDR
Bluetooth protocol: A2DP/AVRCP
Bluetooth distance: 10 meters
Interface: 3.5MM AUX Stereo
Support Mic: Yes,With Microphone Handsfree Calling
Frequency range: 10Hz-20kHz
Signal to noise ratio: >110dB
Product Size: 53.76mm*47.55mm*14mm

Package includes:

1x Bluetooth 5.3 Audio Receiver(1 piece)
1x Type-C Charging Cable
1x User Manual
(If you want to use the TWS mode function, you need to buy 2 pieces.)

Note: It's a VAORLO Bluetooth audio receiver only, not a transmitter. Can only be used for audio transmission,So you couldn't use it for your keyboard, mouse, file transfer.
(The function of the Bluetooth receiver is to add Bluetooth wireless function to the wired speaker/headphone, so that the Bluetooth-enabled device such as the mobile phone can be wirelessly connected to the wired speaker/headphone through the adapter.)