Features:
1. Automatically turn on when you turn on the power, so it is very good to use in the car, otherwise you want it to have an automatic function.
2. Dual device connection: pair your smartphone and tablet at the same time through any stereo system that supports standard 3.5mm or RCA jacks, and stream music from anyone. Connect two Bluetooth devices at the same time to listen to music, make calls, etc.
3. Connect two devices: support the simultaneous connection of 3.5mm audio interface and 2 RCA audio interfaces.
4. Hands-free call & navigation transmission: built-in microphone for hands-free call; a simple answer/redial/end/reject button. In addition, the vikefon Bluetooth car adapter supports sending voice notifications from existing navigation applications, so you don’t need to look down at your phone to ensure driving safety.
5. Wireless music streaming: Stream stereo music to non-Bluetooth headphones and speakers.
6. Space-saving design: ultra-compact and light, convenient to use with various equipment.
7. Ultra stable connection: Our Bluetooth audio adapter is equipped with a Bluetooth 5.2 chip, which can achieve continuous pairing, fast transmission and wide signal range (33 feet). With 3.5mm aux interface and 2 rca interfaces, it can be connected to non-Bluetooth car audio system, home audio, wired headset/speaker, power amplifier/home theater, etc. So you can enjoy wireless high-fidelity music streaming! Note: It is just a vikefon Bluetooth receiver, not a transmitter. So you can't use it for your TV, keyboard, mouse.
8. Automatic connection: When you turn on the Bluetooth receiver next time, it will automatically connect to the last paired Bluetooth device.
9.3 key: Next song/turn up the volume, previous song/turn down the volume, multi-function button (MFB)
10: Update to support U disk playback.
11. Note: It is not a built-in battery, so it is powered by USB charging.

Specifications:
Product model: BLS-B21
Support equipment: support two mobile phones to connect
Bluetooth version: 5.0
Output interface: 3.5mm stereo RCA left and right channels
Function introduction: U disk, hands-free call, NFC connection
Bluetooth protocol: AVRCP, A2DP
Frequency range: 2400-2483.5MHz
Frequency response: 20Hz-20kHz
Output power: 28mW RL=16Ω
Signal to noise ratio: "90dB
Total harmonic distortion: "0.1%
Support SBC, AAC
Forward transmission distance: 10 meters
Support Micro USB interface 5V power supply
Product size 78*50*18 (mm)
Bare metal weight: 32g
Package weight: 100g
Packing size: 135*94*25mm

Package list:
1 * Bluetooth 5.0 audio receiver adapter
1 * 3.5mm auxiliary line
1 * User Manual
1 * USB charging cable
1 * 2rca audio cable