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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1
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Description
MB2 CSR Wireless Audio Adapter Bluetooth 5.0 Receiver & Transmitter, MB21. Bluetooth version: Bluetooth V5. 0 2. Support protocol: RX (A2DP AVRCP), TX (A2DP) 3. Working frequency band: 2. 402GHz 2. 480GHz 4. Support dual stream (TX mode): support a transmitter to connect two Bluetooth speakers or earphones at the same time to use a CODEC at the same time, can support APTX LL 5. Support multi point connection (RX mode): support to connect two mobile phones 6. Battery capacity: 500mAh 7. Charging current: about 350mA 8.
1. Bluetooth version: Bluetooth V5.0
2. Support protocol: RX (A2DP/AVRCP), TX (A2DP)
3. Working frequency band: 2.402GHz -2.480GHz
4. Support dual stream (TX mode): support a transmitter to connect two Bluetooth speakers or earphones at the same time to use a CODEC at the same time, can support APTX LL
5. Support multi-point connection (RX mode): support to connect two mobile phones
6. Battery capacity: 500mAh
7. Charging current: about 350mA
8. Charging time: about 2.5 hours
9. Bluetooth distance: greater than 80m (unobstructed)
10. Charging method: Micro USB 5V/0.5A
11. Input/output connection mode: RCA interface, I2S AUX interface, support RCA, AUX dual simultaneous output
12. Compatible: Android, IOS system mobile phone and PAD, and Bluetooth speakers or earphones supporting A2DP protocol to connect and use
13. Size: about 11x9x2.5cm
14. Weight: about 70g
Features:
1. Exquisite appearance
2. Using CSR high-end chip design
3. One-key switch between RX and TX modes
4. RCA, I2S audio input/output interface, can be switched freely
5. Two antennas, the Bluetooth operating distance is greater than 80M, and the stability is strong
6. High fidelity lossless sound quality, ultra-low latency sound output, support apt-X LL, apt-X, SBC, AAC, FS
7. When the battery is less than 20%, there will be a low battery reminder. After 6 minutes in the RX, TX mode without connection, it will automatically enter the sleep power saving mode, and it has its own battery protection IC, which is safe and reliable while charging.
8. Support dual-stream (TX mode) transmission and connect two Bluetooth audio devices
9. Receive (RX) can be connected to two devices at the same time, any two of the mobile phone/tablet/notebook device, and the volume and up and down songs can be controlled by the buttons during playback
10. Both receiving mode and transmitting mode can realize automatic return connection, and have memory function for connected products
11. Simple connection, no need to drive and download APP
Packing list:
- Adapter x1
- USB charging cable x1
- 3.5mm audio cable x1
- RCA audio cable x1
- Manual x1
Specification:
| Package Weight |
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
LOVE THEM!!
Size: Small, Color: (001) Black / Black / Castlerock
LOVE! These socks are so comfortable! I wear a 5 in women's and a 3 in big kid shoes. The small fit me perfectly. I see where some say they run small but I can't say that was an issue for me. They are "snug" but thats what you want with a no show sock. I feel they have support vs the ones i used to buy at Walmart. They are very soft! I am actually buying more today and throwing my other ones in the trash!
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Reviewed in the United States on February 18, 2026
★★★★★ 5
So will not write down your foot
Size: Medium, Color: (001) Black / Black / Castlerock
I love these socks. They have a little bit of gel on the top of the heel for support in your tennis shoes and so your socks don’t write down. Very good quality.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Comfy and Stay Put
Size: Medium, Color: (002) Black / Black / Halo Gray
These socks are honestly great. They’re super thin and light, so once you have them on, you kind of forget they’re even there. No bulky feeling in your shoes at all.
The best part is they actually stay on. I hate no-show socks that slide down after five minutes, and these don’t do that. The little grip on the heel really works, so you’re not constantly adjusting them all day.
They’re breathable too, which is nice if your feet run warm. They dry fast and don’t get that gross sweaty feeling. And there’s no annoying seam on the toe, so nothing rubs or feels uncomfortable.
Basically, they’re just comfy, stay put, and don’t cause problems — which is all I want from socks.
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Reviewed in the United States on January 16, 2026
★★★★★ 5
Perfect sucks
Size: Medium, Color: (001) Black / Black / Castlerock
Wonderful socks . The weight is perfect !! These do not slip when in a shoe they stay out !!
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Reviewed in the United States on April 14, 2026
★★★★★ 4
Amazing but quality changed
Size: Large, Color: (002) Black / Black / Halo Gray
Love these socks so much, been buying them for about 4 years now!! Not giving them 5 stars anymore because the quality is different and not as good, durable and thick as before.
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Reviewed in the United States on July 10, 2025