Product Name: Bluetooth Music ReceiverModel: B21Supported Devices: Supports two mobile phonesBluetooth Version: 5.2Output Port: 3.5mm stereo RCA left and right channelsFeatures: USB flash drive, supports the latest MP3, WMA, WAV, FLAC, and APE formats. Hands-free calling, NFC connectivityBluetooth Protocols: AVRCP, A2DPFrequency Range: 2400-2483.5MHzFrequency Response: 20Hz-20kHzOutput Power: 28mW RL=16Signal-to-Noise Ratio: 90dBForward Transmission Range: 10 metersSupports Type-C port, 5V power supplyTransmission Rate: 100 MbpsFeatures:1. Automatic Power On: Ideal for use in cars or other applications where you want the device to automatically turn on when connected to a power source.2. Dual Device Link: Pair your smartphone and tablet simultaneously and play music from either using any stereo system that supports a standard 3.5mm or RCA jack. Connect two Bluetooth-compatible devices simultaneously to listen to music, make calls, and more.3. Connect Two Devices: Supports simultaneous connection to the 3.5mm audio port and two RCA audio ports.4. Hands-Free Calling and Navigation Broadcast: A built-in microphone allows for hands-free calling; a simple button lets you answer/redial/end/reject calls. Additionally, the Bluetooth-compatible car adapter supports broadcasting voice notifications from existing navigation apps, ensuring safe driving without having to look down at your phone.5. Wireless Music Streaming: Stream stereo music to non-Bluetooth-compatible headphones and speakers.6. Space-Saving Design: Ultra-compact and lightweight, it's convenient for use with a variety of devices.7. Auto-Connect: The next time you turn it on, this Bluetooth-compatible receiver will automatically connect to the last paired Bluetooth-compatible device.Color: BlackWeight: 32gDimensions: 78*50*18mmPackaging Weight: 108gPackaging Dimensions: 135*94*25mmPackaging: BoxedIncludes: Receiver + AUX audio cable + RCA audio cable + Type-C charging cable + Instruction manual