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16	16	== 1.1 ​What is NDS01 NB-IoT Door Sensor ==
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20		-The Dragino NDS01 is a (% style="color:blue" %)**NB-IOT Door Sensor**(%%) for Internet of Things solution. It is used to (% style="color:blue" %)**detect the open/close event for door and uplink the event** (%%)to IoT server via NB-IoT network.
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	19	+The Dragino NDS01 is a **NB-IOT Door Sensor** for Internet of Things solution. It is used to **detect the open/close event for door and uplink the event** to IoT server via NB-IoT network.
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24	24	Besides open/close event, NDS01 also has an internal temperature and humidity sensor which can detect the temperature and humidity inside the sensor.
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28	28	(% style="color:blue" %)**NarrowBand-Internet of Things (NB-IoT)**(%%) is a standards-based low power wide area (LPWA) technology developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity and spectrum efficiency, especially in deep coverage.
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32		-NDS01 is powered by (% style="color:blue" %)**2 x AAA batteries**(%%) for long term use.
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	25	+NDS01 is powered by **2 x AAA batteries** for long term use.
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36	36	*The measured temperature is 2~~3 degree higher than the actually environment temperature out of NDS01.
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40	40	[[image:1668224602353-769.png]]
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233	233	(% style="color:#037691" %)**6. Alarm and Silencer**
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236	236	**Send: **AT+ALARM=<value>  ~/~/ 0~~1,0: mute 1: buzzer alarm (note that no data will be reported, only the buzzer and the red light are on, if it is in silent mode, only the red light is on)
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239	239	**Reply:** OK
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