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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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Description
VIKEFON BT-21 Bluetooth 5.0 Adapter Bluetooth Audio Transmitter Receiver1. Bluetooth version: V5. 0 2. Support protocol: RX supports A2DP, AVRCP, TX supports A2DP 3. Working frequency band: 2. 402GHz 2. 480GHz 4. Power level: Level 1 5. Sensitivity: 80dBm is less than 0. 1% BER 6. Signal to noise ratio: greater than or equal to 75dB 7. Distortion: less than or equal to 0. 1% 8. Support dual stream (TX mode supports one transmitter to connect two Bluetooth speakers or headphones at the same time to use one CODEC) 9.
1. Bluetooth version: V5.0
2. Support protocol: RX supports A2DP, AVRCP, TX supports A2DP
3. Working frequency band: 2.402GHz-2.480GHz
4. Power level: Level 1
5. Sensitivity: -80dBm is less than 0.1% BER
6. Signal to noise ratio: greater than or equal to 75dB
7. Distortion: less than or equal to 0.1%
8. Support dual stream (TX mode supports one transmitter to connect two Bluetooth speakers or headphones at the same time to use one CODEC)
9. Support multi-point connection (RX mode supports connection of two mobile phones)
10. Codec mode: TX is apt-X HD, apt-X LL, apt-X, SBC; RX is apt-X HD, apt-X LL, apt-X, SBC
11. Note on using APTX: apt-X HD CODEC is preferentially supported in single connection (the connected device must also support apt-X HD)
12. Built-in battery: 1000mAh
13. Charging current: about 200mA
14. Charging time: about 4.5 hours
15. Life time: RX is greater than 20 hours, TX averages about 15 hours
16. Bluetooth distance: greater than 80m (straight line without obstruction)
17. Charging method: Micro USB 5V/0.5A
18. Input/output connection: SPDIF interface, I2S AUX interface
19. Compatible: Android, IOS system phones, tablets and Bluetooth speakers or headphones that support A2DP protocol
20. Dimensions: 114 x 100 x 20mm
21. Weight: 270g
Specification:
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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
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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
4.2 ★★★★★
Based on 2125 reviews
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Product Reviews
★★★★★ 3
Dies after a Year
Color: 5566-ZP-white face
Watch worked fine for about a year, then just stopped working - just like that. No amount of shaking or gentle impacts would get it to start ticking again.
I'd also say my biggist issue with it was it was always difficult to tell which hand was the second hand and which hand was the minute hand since they're both the same color and thickness. Wish the hour and minute hands were a little thicker so they'd stand out a little better and/or that the minute hand was a different color so it was offset. Resulted in having to study the watch to get the time instead of a quick glimpse to see what time it was. Irritating after a while.
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Reviewed in the United States on February 15, 2026
★★★★★ 5
They were lightweight and attractive
Color: 5535-HP-white
Sleek and attractive
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Blue faced watch.
Color: 5535-ZP-blue
Looks great
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Good all around!!
Color: Dark Brown band & Rose Gold bezel & White dial
So far this is a very nice watch, light, thin, keeps good time, looks nice, nice band, nice price!!
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Good quality
Color: Mesh Strap watch balck blue
Beautiful watch,
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Reviewed in the United States on May 9, 2026