Bluetooth Everywhere With the updated V5.3 EDR technology, our wireless audio adapter enables more stable connection with device. Only 1 device can be paired at a time, it does not transmit to multiple devices, the distance between the bluetooth adapter and your bluetooth device should be within 50 feet. The charging standard of the product is 5V1A. Do not use a high current adapter to charge the product.NoteWhen directly using the USB charging cable to transmit audio to the computer, you do not need to use a 3.5mm audio cable to connect to the computer. Directly using USB cable to transmit audio to the computer, the computer system volume cannot be adjusted, only volume of software can be played. Pay attention to whether you want to receive or transmit when you use it. Don't make a mistake. RX to receive, TX to transmit, and there will be no sound when you connect incorrectly.Always On Bluetooth 3-in-1 Adapter continuously streams even while charging. Built-in battery for up to 10 hours use - enjoy your favorite wireless content all the time. The red indicator light is always on when charging, volume buttons don't work, and the indicator is off after charging is completed. The common ground current noise may cause noise. We suggest not to use it while charging to avoid the current noise. It's better to wait until it's fully charged before using it.Latest Bluetooth Transmitter When the USB charging data cable is plugged into PC, it can be used as a transmitter to transmit audio, enabling the computer to have bluetooth function. Proper ear bud fit and software update can help in reducing noise issue, make sure the earbuds and phone or any other device have the latest software version installed. The product that does not work may have insufficient initial battery power. Please try to use it after fully charging.Noted1.If you cannot connect the Bluetooth adapter to your Bluetooth headphones/earbuds/earphones the first time,please firstly make sure your device is not connected to any other device while pairing,keep the device close to each other during pairing;2.Our Bluetooth adapter is equipped with advanced decoders.If you encounter sound quality issues,double-check the audio source for optimal performance;3.Most instruments like guitars require 2.4G transfer to achieve audio signal synchronization.This Bluetooth adapter is mainly used for Bluetooth transfer between headphones and common audio equipment,please do not use it for music performance;4.For TV,please firstly make sure it has 3.5mm AUX.