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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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Description
GPS Real-Time Tracking BraceletGPS accurate positioning: GPS + LBS + AGPS + WIFI multi positioning, open mobile application, you can check the location of watch anytime and anywhere, and find elderly. This positioning bracelet smartphone watch can monitor heart rate, wireless smart design, safe, secure, and convenient. Fitness tracker: You can use a smart bracelet to track your entire activity. Pedometer wristband can display a number of steps and distance moved. Use this related
- GPS accurate positioning: GPS + LBS + AGPS + WIFI multi-positioning, open mobile application, you can check the location of watch anytime and anywhere, and find elderly. This positioning bracelet smartphone watch can monitor heart rate, wireless smart design, safe, secure, and convenient.
- Fitness tracker: You can use a smart bracelet to track your entire activity. Pedometer wristband can display a number of steps and distance moved. Use this related data to better understand your fitness level and view the real-time history or history of the elderly at any time.
- Safe electronic fence: safe area of the counter can be customized. If the time exceeds this range, the mobile app will automatically remind you to prevent accidents. Phone can also set an alarm clock to remind the elderly to take medicine and rest.
- Independent call: By positioning the watch, the family number can be set, two-way conversation, the watch supports micro SIM card. Use mobile phone (/ IOS) to save QR code scanning application in manual.
- Screen Size: No Display
- Material: Plastic
- Battery Capacity: 401mAh
- Wearing Method: Wrist Strap
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4.3 ★★★★★
Based on 2044 reviews
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Product Reviews
★★★★★ 5
Thicker than I anticiapted
Format: Paperback
The encyclopedia of DNS books, meaning thicker than a phone book.
I like the fact that this book is thick but so easy to read and follow along with. If you know nothing about DNS, this book makes it easy to learn about DNS. It starts with the history of DNS and then explains the hierarchy of the DNS tree. A must read if you want to improve your understanding of the internet and what happens under the hood for name resolution.
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Reviewed in the United States on February 7, 2014
★★★★★ 5
Best practical book on DNS and how it works
Format: Kindle
I was interested in finding out more about how DNS is deployed and operated in practice. The first few chapters in this book deliver very well in this regard. My motivation was to find out more about how a certain type of Internet attack -- the "open DNS resolver attack" -- works. Even though this book was written well before this attack became popular and well known -- and therefore the attack is not mentioned, let alone analyzed -- the book was still quite helpful to me.
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Reviewed in the United States on June 1, 2014
★★★★★ 5
DNS reference
Format: Paperback
The book arrived in perfect condition. This a reference of dns related knowledge.
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Reviewed in the United States on July 11, 2024
★★★★★ 5
One of the best books I've read on DNS and BIND
Format: Kindle
DNS is one of those concepts that is almost kept in mystery in the tech world. The knowledge seems to be passed by word of mouth, and there doesn't seem to be one good repository to go to as an information source. That is not to say that this book is all inclusive, no book can contain every piece of knowledge you need/desire, especially on such a complex topic. This book however does a phenomenal job of demystifying the subject and giving a good, practical understanding of how DNS and BIND work.
I would highly recommend this book to anyone, whether it be the new network/sys admin who has just had complex networking needs dropped on his lap, or even the seasoned network admin who needs a good convenient reference on occasion.
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Reviewed in the United States on May 11, 2013
★★★★★ 5
The book is good
Format: Paperback
Good quality and good information, pretty dusty when I got it.
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Reviewed in the United States on May 29, 2026