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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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Description
S21 Riding Helmet Bluetooth Intercom Headset, Specification:, S211. Structure waterproof and nano waterproof, effectively blocking rain, rain can also be used 2. USB interface charging, support charging while using 3. Intelligent power management system, low power consumption 4. Functions: call, voice, music, FM 5. Bluetooth: 5. 0 6. Transmission distance: about 10m 7. Sound channel: stereo sound 8. Battery capacity: 1000mAh 9. Charging interface: USB 10. Charging time: about 2 3h 11. Use time: about 21h 12.
1. Structure waterproof and nano-waterproof, effectively blocking rain, rain can also be used
2. USB interface charging, support charging while using
3. Intelligent power management system, low power consumption
4. Functions: call, voice, music, FM
5. Bluetooth: 5.0
6. Transmission distance: about 10m
7. Sound channel: stereo sound
8. Battery capacity: 1000mAh
9. Charging interface: USB
10. Charging time: about 2-3h
11. Use time: about 21h
12. Material: ABS, silicone
13. Waterproof rating: IP67
14. Weight: about 199g
Packing list:
- Earphone x 1
- USB charging cable x 1
- Instruction manual x 1
- Paste sheet x4
Specification:
| Package Weight |
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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4.3 ★★★★★
Based on 686 reviews
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Product Reviews
★★★★★ 5
All around helpful---worth the money!
Format: Paperback
This guide has been most helpful for all the folks I help prepare for the iTEP test! It gives insight into what each section of the test is looking for along with examples and great tips about actually TAKING the test. In the Writing and Speaking sections, it also gives sample scores and comments from the Master Grader which is very helpful too.
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Reviewed in the United States on August 9, 2019
★★★★★ 5
Comprehensive, clear and coherent!
Format: Paperback
The iTEP Practice Guide combines a no-nonsense approach to the specific iTEP tests and at the same time offers exercises that task the student with what they need to know. Exercises not only serve the purpose of scoring well, but the overall approach is communicative competence. We use the text in our group and one-to-one classes with very positive--and lasting--results.
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Reviewed in the United States on July 23, 2019
★★★★★ 1
No recomiendo
Format: Paperback
Muy malo, no vine completo, además se demoró mucho más de lo que decía al momento de comprarlo. Solo aplazaban la fecha de entrega sin consultar cómo afectaba al cliente. Yo tuve que presentar el examen sin el libro, porque no llegó en la fecha que decía al comprarlo y después se cambió 3 veces la fecha, casi cumpliendo el mes.
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Reviewed in the United States on December 30, 2025
★★★★★ 5
Great Book
Format: Hardcover
Great book
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Reviewed in the United States on July 2, 2025
★★★★★ 5
Great read. Tons of info.
Format: Hardcover
We really like this book. A great background and detailed info on this topic. Really like the real-world examples and application. Pretty exhaustive, as far as that is possible given the topic. Also, quite easy to read, although I confess that if from an engineer's perspective.
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Reviewed in the United States on July 1, 2021