The appearance of the product is exquisite.Using Bluetooth 5.0 chip design, the compatibility and stability are stronger.Bluetooth receiving (RX), Bluetooth transmitting (TX) two in one. Equipped with a high-definition LED digital display, the working status and Bluetooth mode are clearly visible.Built-in digital to analog chip, supports AUX, RCA, USB, TF interface.Cool breathing light, red/blue dual-color, soft and not dazzling.Built-in 400mAh rechargeable lithium battery, long battery life. Support USB (U disk), TF card playback and launch.Support 5~8 meters infrared remote control (remote control version only)Built-in high-definition microphone, support wireless music , hands-free calling, navigation.The product connection is simple, without any cumbersome drive and APP download;Product model: Bluetooth version: Bluetooth V5.0Support protocol: RX: A2DP AVRC TX: A2DPWorking frequency band: 2.402GHz -2.480GHzPower level: Power level 2 (Class II)Sensitivity: -85dBm Less than 0.1%BERSignal-to-noise ratio: 90dBDistortion: less than 0.1%Interface Type: Input: 3.5mm AUX+RCA+USB+TFOutput: 3.5mm AUX+RCASupported formats: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC//DTS/MIDI/G726/MTYScreen size: 33x14x4MMWorking current: Less than 40mABuilt-in battery: 3.7V/400mAhCharging current: about 500mACharging time: about 1 hourBattery life: RX about 6-8H, TX about 8HBluetooth distance: less than 10M (open place)Charging : -USB 5V/0.5ACompatible devices: Android, IOS system mobile phones and PADs, active speakers, power amplifiers, and Bluetooth speakers or headphones that support A2DP/protocol.Colour:blackMaterial:plasticPackage Contents:1 x Bluetoo Transmitter Receiver1 x Remote Control1 x Audio Cable1 x RCA Cable1 x Type C Cable1 x English manualOnly 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.