Easy to Operatevolume up/down and start/pause buttons design, you can easily control music, volume with one click. This Bluetooth receiver powers on when plugged into an outlet and automatically reconnects with a previously paired device. Bluetooth 5.3 AUX ReceiverThe Bluetooth receiver is equipped with the latest Bluetooth 5.3 chip, providing a more stable connection and faster signal transmission. Automatically reconnects to paired devices after power on, with a Bluetooth range of up to 33 feet. This is only a Bluetooth receiver not a Bluetooth transmitter Bluetooth use 1.This product does not have a battery, and requires USB 5V power supply. 2. Connect the receiver with the power amplifier/audio system via the audio cable. 3. Open the mobile phone Bluetooth, search:YET-R20, click to pair. 4. Play music. Play UDISK music 1. Power-on state, insert the Udisk, Music format: MP3 WMA FLAC APE WAV 2. R20 will auto play music. Warning 1. Please do not strike, disassemble,or puncture the device at will. Do not use in water, moisture,exposure, high temperature environment to prevent malfunction or fire. 2. Please do not use this equipment in the places that are not allowed by the national regulations. 3.Do not throw this product into water or other liquids or fire, otherwise it will cause permanent damage. QA: 1. Static noise: Answer: This may be caused by the insufficient power supply. Please try replacing the power supply and use a standard 5V 1A power adapter to power it. Please power the adapter separately and do not plug it into the USB power port of your TV or computer. Whats in the package 1 x 3.5 mm AUX Audio cable 1 x USB Type-C Power cable 1 x User manual 1 x Bluetooth receiver